| airlock | (noun) a chamber that provides access to space where air is under pressure | Synonyms: air lock |
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| ballock | (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, bollock, egg, nut, orchis, testicle, testis |
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| block | (noun) the act of obstructing or deflecting someone's movements | Synonyms: blocking |
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| (noun) a solid piece of something (usually having flat rectangular sides) | - |
| (noun) an obstruction in a pipe or tube | Synonyms: blockage, closure, occlusion, stop, stoppage |
| (noun) a simple machine consisting of a wheel with a groove in which a rope can run to change the direction or point of application of a force applied to the rope | Synonyms: pulley-block, pulley, pulley block |
| (noun) a metal casting containing the cylinders and cooling ducts of an engine | Synonyms: cylinder block, engine block |
| (noun) a platform from which an auctioneer sells | Synonyms: auction block |
| (noun) housing in a large building that is divided into separate units | - |
| (noun) an inability to remember or think of something you normally can do; often caused by emotional tension | Synonyms: mental block |
| (noun) a number or quantity of related things dealt with as a unit | - |
| (noun) a rectangular area in a city surrounded by streets and usually containing several buildings | Synonyms: city block |
| (noun) (computer science) a sector or group of sectors that function as the smallest data unit permitted | - |
| (noun) a three-dimensional shape with six square or rectangular sides | Synonyms: cube |
| (verb) shape into a block or blocks | - |
| (verb) shape by using a block | - |
| (verb) prohibit the conversion or use of (assets) | Synonyms: freeze, immobilise, immobilize |
| (verb) be unable to remember | Synonyms: blank out, draw a blank, forget |
| (verb) interfere with or prevent the reception of signals | Synonyms: jam |
| (verb) impede the movement of (an opponent or a ball) | Synonyms: deflect, parry |
| (verb) render unsuitable for passage | Synonyms: bar, barricade, block off, block up, blockade, stop |
| (verb) obstruct | Synonyms: choke up, lug, stuff |
| (verb) stamp or emboss a title or design on a book with a block | - |
| (verb) support, secure, or raise with a block | - |
| (verb) block passage through | Synonyms: close up, impede, jam, obstruct, obturate, occlude |
| (verb) shut out from view or get in the way so as to hide from sight | Synonyms: obstruct |
| (verb) interrupt the normal function of by means of anesthesia | - |
| (verb) hinder or prevent the progress or accomplishment of | Synonyms: blockade, embarrass, hinder, obstruct, stymie, stymy |
| (verb) stop from happening or developing | Synonyms: halt, kibosh, stop |
| (verb) run on a block system | - |
| 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 |
| 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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| bullock | (noun) castrated bull | Synonyms: steer |
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| (noun) young bull | - |
| cellblock | (noun) a division of a prison (usually consisting of several cells) | Synonyms: ward |
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| chadlock | (noun) weedy Eurasian plant often a pest in grain fields | Synonyms: Brassica kaber, charlock, field mustard, Sinapis arvensis, wild mustard |
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| charlock | (noun) weedy Eurasian plant often a pest in grain fields | Synonyms: Brassica kaber, chadlock, field mustard, Sinapis arvensis, wild mustard |
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| chockablock | (adjective) packed full to capacity | Synonyms: chock-full, chockful, choke-full, chuck-full, cram full |
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| clock | (noun) a timepiece that shows the time of day | - |
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| (verb) measure the time or duration of an event or action or the person who performs an action in a certain period of time | Synonyms: time |
| deadlock | (noun) a situation in which no progress can be made or no advancement is possible | Synonyms: dead end, impasse, stalemate, standstill |
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| doorlock | (noun) a lock on an exterior door | - |
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| dreadlock | (noun) one of many long thin braids of hair radiating from the scalp; popularized by Rastafarians | - |
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| fetlock | (noun) projection behind and above a horse's hoof | - |
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| (noun) the joint between the cannon bone and the pastern | Synonyms: fetlock joint |
| firelock | (noun) a muzzle loader that had a flintlock type of gunlock | Synonyms: flintlock |
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| flintlock | (noun) an obsolete gunlock that has flint embedded in the hammer; the flint makes a spark that ignites the charge | - |
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| (noun) a muzzle loader that had a flintlock type of gunlock | Synonyms: firelock |
| flock | (noun) a group of birds | - |
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| (noun) a group of sheep or goats | Synonyms: fold |
| (noun) a church congregation guided by a pastor | - |
| (noun) an orderly crowd | Synonyms: troop |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, stack, tidy sum, wad |
| (verb) come together as in a cluster or flock | Synonyms: clump, cluster, constellate |
| (verb) move as a crowd or in a group | - |
| forelock | (noun) a lock of a horse's mane that grows forward between the ears | Synonyms: foretop |
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| (noun) a lock of hair growing (or falling) over the forehead | - |
| gridlock | (noun) a traffic jam so bad that no movement is possible | - |
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| gunlock | (noun) the action that ignites the charge in a firearm | Synonyms: firing mechanism |
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| hammerlock | (noun) a wrestling hold in which the opponent's arm is twisted up behind his back | - |
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| handlock | (noun) shackle that consists of a metal loop that can be locked around the wrist; usually used in pairs | Synonyms: cuff, handcuff, manacle |
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| havelock | (noun) a cloth covering for a service cap with a flap extending over the back of the neck to protect the neck from direct rays of the sun | - |
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| headlock | (noun) a wrestling hold in which the opponent's head is locked between the crook of your elbow and the side of your body | - |
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| hemlock | (noun) an evergreen tree, could refer to any one of a genus of conifers named Tsuga | Synonyms: hemlock tree |
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| (noun) soft coarse splintery wood of a hemlock tree especially the western hemlock | - |
| (noun) large branching biennial herb native to Eurasia and Africa and adventive in North America having large fernlike leaves and white flowers; usually found in damp habitats; all parts extremely poisonous | Synonyms: California fern, Conium maculatum, Nebraska fern, poison hemlock, poison parsley, winter fern |
| (noun) poisonous drug derived from an Eurasian plant of the genus Conium | - |
| hillock | (noun) a small natural hill | Synonyms: hammock, hummock, knoll, mound |
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| interlock | (noun) the act of interlocking or meshing | Synonyms: interlocking, mesh, meshing |
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| (noun) a device that prevents an automotive engine from starting | Synonyms: ignition interlock |
| (verb) coordinate in such a way that all parts work together effectively | Synonyms: mesh |
| (verb) become engaged or intermeshed with one another | Synonyms: lock |
| (verb) hold in a locking position | Synonyms: interlace, lock |
| lock | (noun) any wrestling hold in which some part of the opponent's body is twisted or pressured | - |
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| (noun) a fastener fitted to a door or drawer to keep it firmly closed | - |
| (noun) a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key | Synonyms: ignition lock |
| (noun) enclosure consisting of a section of canal that can be closed to control the water level; used to raise or lower vessels that pass through it | Synonyms: lock chamber |
| (noun) a mechanism that detonates the charge of a gun | - |
| (noun) a strand or cluster of hair | - |
| (verb) become rigid or immoveable | - |
| (verb) fasten with a lock | - |
| (verb) keep engaged | Synonyms: engage, mesh, operate |
| (verb) place in a place where something cannot be removed or someone cannot escape | Synonyms: lock away, lock in, lock up, put away, shut away, shut up |
| (verb) become engaged or intermeshed with one another | Synonyms: interlock |
| (verb) hold in a locking position | Synonyms: interlace, interlock |
| (verb) build locks in order to facilitate the navigation of vessels | - |
| (verb) hold fast (in a certain state) | - |
| (verb) pass by means through a lock in a waterway | - |
| matchlock | (noun) an early style of musket; a slow-burning wick would be lowered into a hole in the breech to ignite the charge | - |
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| oarlock | (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing | Synonyms: peg, pin, rowlock, thole, tholepin |
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| overclock | (verb) To run a processor (CPU), or any electronic logic device, at a speed higher than is recommended by the manufacturer. | - |
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| padlock | (noun) a detachable lock; has a hinged shackle that can be passed through the staple of a hasp or the links in a chain and then snapped shut | - |
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| (verb) fasten with a padlock | - |
| pillock | (noun) a person who is not very bright | Synonyms: dolt, dullard, poor fish, pudden-head, pudding head, stupe, stupid, stupid person |
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| pollock | (noun) important food and game fish of northern seas (especially the northern Atlantic); related to cod | Synonyms: Pollachius pollachius, pollack |
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| (noun) lean white flesh of North Atlantic fish; similar to codfish | Synonyms: pollack |
| roadblock | (noun) a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc. | Synonyms: barricade |
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| (noun) any condition that makes it difficult to make progress or to achieve an objective | Synonyms: barrier |
| rowlock | (noun) a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing | Synonyms: oarlock, peg, pin, thole, tholepin |
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| schlock | (noun) merchandise that is shoddy or inferior | Synonyms: dreck, shlock |
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| sherlock | (noun) someone who can be employed as a detective to collect information and assist in criminal investigations | Synonyms: operative, PI, private detective, private eye, private investigator, shamus |
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| shlock | (noun) merchandise that is shoddy or inferior | Synonyms: dreck, schlock |
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| shylock | (noun) someone who lends money at excessive rates of interest | Synonyms: loan shark, moneylender, usurer |
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| sunblock | (noun) a cream spread on the skin; contains a chemical (as PABA) to filter out ultraviolet light and so protect from sunburn | Synonyms: sun blocker, sunscreen |
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| unblock | (verb) make (assets) available | Synonyms: free, release, unfreeze |
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| (verb) play the cards of (a suit) so that the last trick on which a hand can follow suit will be taken by a higher card in the hand of a partner who has the remaining cards of a combined holding | - |
| (verb) clear or remove an obstruction from | - |
| unlock | (verb) become unlocked | - |
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| (verb) open the lock of | - |
| (verb) set free or release | - |
| warlock | (noun) a male witch or demon | - |
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| wedlock | (noun) the state of being a married couple voluntarily joined for life (or until divorce) | Synonyms: marriage, matrimony, spousal relationship, union |
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