| blockhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| blockhouse | (noun) a stronghold that is reinforced for protection from enemy fire; with apertures for defensive fire | - |
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| blocking | (noun) the act of obstructing or deflecting someone's movements | Synonyms: block |
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| bloke | (noun) a boy or man | Synonyms: blighter, chap, cuss, fella, feller, fellow, gent, lad |
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| bloodstock | (noun) thoroughbred horses (collectively) | - |
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| bloodsucker | (noun) carnivorous or bloodsucking aquatic or terrestrial worms typically having a sucker at each end | Synonyms: hirudinean, leech |
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| blowback | (noun) Blowback is a system of operation for self-loading firearms that obtains energy from the motion of the cartridge case as it is pushed to the rear by expanding gases created by the ignition of the propellant charge. | - |
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| (noun) misinformation resulting from the recirculation into the source country of disinformation previously planted abroad by that country's intelligence service | - |
| (noun) the backward escape of gases and unburned gunpowder after a gun is fired | Synonyms: backfire |
| bluejacket | (noun) a serviceman in the navy | Synonyms: navy man, sailor, sailor boy |
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| bluestocking | (noun) a woman having literary or intellectual interests | Synonyms: bas bleu |
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| bluetick | (noun) a very fast American hound; white mottled with bluish grey | - |
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| boardwalk | (noun) a walkway made of wooden boards; usually at seaside | - |
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| bobbysock | (noun) a sock that reaches just above the ankle | Synonyms: anklet, anklets, bobbysocks |
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| bobbysocks | (noun) a sock that reaches just above the ankle | Synonyms: anklet, anklets, bobbysock |
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| bobolink | (noun) migratory American songbird | Synonyms: Dolichonyx oryzivorus, reedbird, ricebird |
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| bock | (noun) a very strong lager traditionally brewed in the fall and aged through the winter for consumption in the spring | Synonyms: bock beer |
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| bodkin | (noun) a blunt needle for threading ribbon through loops | Synonyms: threader |
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| (noun) a small sharp-pointed tool for punching holes in leather or fabric | - |
| (noun) formerly a long hairpin; usually with an ornamental head | - |
| (noun) a dagger with a slender blade | Synonyms: poniard |
| bodywork | (noun) the work of making or repairing vehicle bodies | - |
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| (noun) the exterior body of a motor vehicle | - |
| bollock | (noun) a pulley-block at the head of a topmast | Synonyms: bullock block |
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| (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, ballock, egg, nut, orchis, testicle, testis |
| boneshaker | (noun) any wheeled vehicle that is dilapidated and uncomfortable | - |
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| book | (noun) physical objects consisting of a number of pages bound together | Synonyms: volume |
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| (noun) a number of sheets (ticket or stamps etc.) bound together on one edge | - |
| (noun) a written work or composition that has been published (printed on pages bound together) | - |
| (noun) a written version of a play or other dramatic composition; used in preparing for a performance | Synonyms: playscript, script |
| (noun) a compilation of the known facts regarding something or someone | Synonyms: record, record book |
| (noun) a major division of a long written composition | - |
| (noun) a collection of rules or prescribed standards on the basis of which decisions are made | Synonyms: rule book |
| (noun) a collection of playing cards satisfying the rules of a card game | - |
| (noun) a record in which commercial accounts are recorded | Synonyms: account book, book of account, ledger, leger |
| bookbinder | (noun) a worker whose trade is binding books | - |
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| bookbindery | (noun) a bookbinder's workshop; a place for binding books | - |
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| bookbinding | (noun) the craft of binding books | - |
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| bookcase | (noun) a piece of furniture with shelves for storing books | - |
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| bookcloth | (noun) a woven fabric (usually cotton) used for book covers. | Synonyms: book cloth |
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| bookclub | (noun) a club that people join in order to buy selected books at reduced prices | - |
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| bookdealer | (noun) a dealer in books; a merchant who sells books | Synonyms: book seller |
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| bookend | (noun) a support placed at the end of a row of books to keep them upright (on a shelf or table) | - |
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| booker | (noun) someone who engages a person or company for performances | Synonyms: booking agent |
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| bookfair | (noun) bazaar at which books are sold or auctioned off in order to raise funds for a worthy cause | Synonyms: book fair |
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| (noun) fair organized by publishers or booksellers to promote the sale of books | Synonyms: book fair |
| bookie | (noun) a gambler who accepts and pays off bets (especially on horse races) | Synonyms: bookmaker |
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| booking | (noun) the act of reserving (a place or passage) or engaging the services of (a person or group) | Synonyms: reservation |
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| (noun) employment for performers or performing groups that lasts for a limited period of time | Synonyms: engagement |
| bookishness | (noun) exaggerated studiousness | - |
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| bookkeeper | (noun) someone who records the transactions of a business | - |
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| bookkeeping | (noun) the activity of recording business transactions | Synonyms: clerking |
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| booklet | (noun) a small book usually having a paper cover | Synonyms: brochure, folder, leaflet, pamphlet |
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| booklouse | (noun) minute wingless psocopterous insects injurious to books and papers | Synonyms: book louse, deathwatch, Liposcelis divinatorius |
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| booklover | (noun) someone who loves (and usually collects) books | Synonyms: bibliophile, book lover |
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| bookmaker | (noun) a gambler who accepts and pays off bets (especially on horse races) | Synonyms: bookie |
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| (noun) a maker of books; someone who edits or publishes or binds books | - |
| bookman | (noun) a learned person; someone who by long study has gained mastery in one or more disciplines | Synonyms: scholar, scholarly person |
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| bookmark | (noun) a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place | Synonyms: bookmarker |
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| bookmarker | (noun) a marker (a piece of paper or ribbon) placed between the pages of a book to mark the reader's place | Synonyms: bookmark |
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| bookmobile | (noun) a van with shelves of books; serves as a mobile library or bookstore | - |
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| bookplate | (noun) a label identifying the owner of a book in which it is pasted | Synonyms: ex libris |
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| bookseller | (noun) the proprietor of a bookstore | - |
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| bookshelf | (noun) a shelf on which to keep books | - |
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| bookshop | (noun) a shop where books are sold | Synonyms: bookstall, bookstore |
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| bookstall | (noun) a shop where books are sold | Synonyms: bookshop, bookstore |
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| bookstore | (noun) a shop where books are sold | Synonyms: bookshop, bookstall |
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| bookworm | (noun) someone who spends a great deal of time reading | - |
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| (noun) a person who pays more attention to formal rules and book learning than they merit | Synonyms: pedant, scholastic |
| boondocks | (noun) a remote and undeveloped area | Synonyms: back country, backwoods, hinterland |
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| bootblack | (noun) a person who polishes shoes and boots | Synonyms: shoeblack |
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| bootjack | (noun) has V-shaped notch for pulling off boots | - |
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| bootlicker | (noun) someone who humbles himself as a sign of respect; who behaves as if he had no self-respect | Synonyms: apple polisher, fawner, groveler, groveller, truckler |
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| bootmaker | (noun) a maker of boots | Synonyms: boot maker |
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| bosk | (noun) a small wooded area | - |
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| bottleneck | (noun) the narrow part of a bottle near the top | - |
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| (noun) a narrowing that reduces the flow through a channel | Synonyms: chokepoint, constriction |
| bowknot | (noun) a knot with two loops and loose ends; used to tie shoelaces | Synonyms: bow |
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| bracken | (noun) large coarse fern often several feet high; essentially weed ferns; cosmopolitan | Synonyms: brake, pasture brake, Pteridium aquilinum |
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| (noun) fern of southeastern Asia; not hardy in cold temperate regions | Synonyms: Pteridium esculentum |
| bracket | (noun) a support projecting from a wall (as to hold a shelf) | Synonyms: wall bracket |
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| (noun) either of two punctuation marks ([ or ]) used to enclose textual material | Synonyms: square bracket |
| (noun) either of two punctuation marks (`<' or `>') used in computer programming and sometimes used to enclose textual material | Synonyms: angle bracket |
| (noun) a category falling within certain defined limits | - |
| brackishness | (noun) the quality of being salty, as the saltiness of water | - |
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| brainworker | (noun) someone whose profession involves using his head to solve problems | Synonyms: brain-worker |
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| brake | (noun) a restraint used to slow or stop a vehicle | - |
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| (noun) anything that slows or hinders a process | - |
| (noun) an area thickly overgrown usually with one kind of plant | - |
| (noun) large coarse fern often several feet high; essentially weed ferns; cosmopolitan | Synonyms: bracken, pasture brake, Pteridium aquilinum |
| (noun) any of various ferns of the genus Pteris having pinnately compound leaves and including several popular houseplants | - |
| brakeman | (noun) a railroad employee responsible for a train's brakes | - |
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| brakes | (noun) a braking device consisting of a combination of interacting parts that work to slow a motor vehicle | Synonyms: brake system |
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| breadbasket | (noun) a basket for serving bread | - |
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| (noun) an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion | Synonyms: stomach, tum, tummy |
| (noun) a geographic region serving as the principal source of grain | - |
| breadstick | (noun) a crisp stick-shaped roll; often served with soup | Synonyms: bread-stick |
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| break | (noun) the act of breaking something | Synonyms: breakage, breaking |
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| (noun) an act of delaying or interrupting the continuity | Synonyms: disruption, gap, interruption |
| (noun) a sudden dash | - |
| (noun) the opening shot that scatters the balls in billiards or pool | - |
| (noun) an escape from jail | Synonyms: breakout, gaolbreak, jailbreak, prison-breaking, prisonbreak |
| (noun) a pause from doing something (as work) | Synonyms: recess, respite, time out |
| (noun) any frame in which a bowler fails to make a strike or spare | Synonyms: open frame |
| (noun) (tennis) a score consisting of winning a game when your opponent was serving | Synonyms: break of serve |
| (noun) some abrupt occurrence that interrupts an ongoing activity | Synonyms: interruption |
| (noun) an unexpected piece of good luck | Synonyms: good luck, happy chance |
| (noun) the occurrence of breaking | - |
| (noun) a personal or social separation (as between opposing factions) | Synonyms: breach, falling out, rift, rupture, severance |
| (noun) an abrupt change in the tone or register of the voice (as at puberty or due to emotion) | - |
| (noun) (geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other | Synonyms: fault, faulting, fracture, geological fault, shift |
| (noun) breaking of hard tissue such as bone | Synonyms: fracture |
| (noun) a time interval during which there is a temporary cessation of something | Synonyms: intermission, interruption, pause, suspension |
| breakability | (noun) quality of being easily damaged or destroyed | Synonyms: fragility, frangibility, frangibleness |
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| breakable | (noun) an article that is fragile and easily broken | - |
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| breakableness | (noun) the consistency of something that breaks under pressure | - |
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| breakage | (noun) the act of breaking something | Synonyms: break, breaking |
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| (noun) reimbursement for goods damaged while in transit or in use | - |
| (noun) the quantity broken | - |
| breakaway | (noun) the act of breaking away or withdrawing from | Synonyms: breaking away |
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| breakax | (noun) West Indian timber tree having very hard wood | Synonyms: break-axe, breakaxe, Sloanea jamaicensis |
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| breakaxe | (noun) West Indian timber tree having very hard wood | Synonyms: break-axe, breakax, Sloanea jamaicensis |
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| breakdown | (noun) the act of disrupting an established order so it fails to continue | Synonyms: dislocation |
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| (noun) an analysis into mutually exclusive categories | Synonyms: partitioning |
| (noun) a cessation of normal operation | Synonyms: equipment failure |
| (noun) (biology) the process of decay caused by bacterial or fungal action | Synonyms: decomposition, putrefaction, rot, rotting |
| (noun) (chemistry) separation of a substance into two or more substances that may differ from each other and from the original substance | Synonyms: chemical decomposition reaction, decomposition, decomposition reaction |
| (noun) a mental or physical breakdown | Synonyms: crack-up |
| breaker | (noun) a device that trips like a switch and opens the circuit when overloaded | Synonyms: circuit breaker |
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| (noun) waves breaking on the shore | Synonyms: breakers, surf |
| (noun) a quarry worker who splits off blocks of stone | Synonyms: ledgeman |
| breakers | (noun) waves breaking on the shore | Synonyms: breaker, surf |
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| breakfast | (noun) the first meal of the day (usually in the morning) | - |
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| breaking | (noun) the act of breaking something | Synonyms: break, breakage |
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| breakout | (noun) an escape from jail | Synonyms: break, gaolbreak, jailbreak, prison-breaking, prisonbreak |
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| breakstone | (noun) any of various plants of the genus Saxifraga | Synonyms: rockfoil, saxifrage |
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| breakthrough | (noun) a penetration of a barrier such as an enemy's defense | - |
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| (noun) making an important discovery | - |
| (noun) a productive insight | Synonyms: discovery, find |
| breakup | (noun) the termination or disintegration of a relationship (between persons or nations) | Synonyms: dissolution |
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| (noun) coming apart | Synonyms: detachment, separation |
| breakwater | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: bulwark, groin, groyne, jetty, mole, seawall |
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| breaststroke | (noun) a swimming stroke; the arms are extended together in front of the head and swept back on either side accompanied by a frog kick | - |
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| breaststroker | (noun) someone who swims the breaststroke | - |
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| breastwork | (noun) fortification consisting of a low wall | Synonyms: parapet |
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| breechblock | (noun) a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing | Synonyms: breech closer |
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| brick | (noun) rectangular block of clay baked by the sun or in a kiln; used as a building or paving material | - |
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| (noun) a good fellow; helpful and trustworthy | - |
| brickbat | (noun) blunt criticism | - |
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| (noun) a fragment of brick used as a weapon | - |
| brickfield | (noun) a place where bricks are made and sold | Synonyms: brickyard |
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| brickkiln | (noun) a kiln for making bricks | - |
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| bricklayer | (noun) a craftsman skilled in building with bricks | - |
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| bricklaying | (noun) the craft of laying bricks | - |
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| brickwork | (noun) masonry done with bricks and mortar | - |
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| brickyard | (noun) a place where bricks are made and sold | Synonyms: brickfield |
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| bridecake | (noun) a rich cake with two or more tiers and covered with frosting and decorations; served at a wedding reception | Synonyms: wedding cake |
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| bridgework | (noun) a denture anchored to teeth on either side of missing teeth | Synonyms: bridge |
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| brink | (noun) the limit beyond which something happens or changes | Synonyms: verge |
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| (noun) the edge of a steep place | - |
| (noun) a region marking a boundary | Synonyms: threshold, verge |