| backsaw | (noun) a handsaw that is stiffened by metal reinforcement along the upper edge | Synonyms: back saw |
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| backscatter | (verb) scatter (radiation) by the atoms of the medium through which it passes | - |
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| backscratcher | (noun) a long-handled scratcher for scratching your back | - |
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| (noun) someone who is willing to trade favors or services for mutual advantage | - |
| backseat | (noun) a seat at the back of a vehicle (especially the seat at the back of an automobile) | - |
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| (noun) a secondary or inferior position or status | - |
| backsheesh | (noun) a relatively small amount of money given for services rendered (as by a waiter) | Synonyms: baksheesh, bakshis, bakshish, gratuity, pourboire, tip |
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| backside | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| (noun) the side of an object that is opposite its front | Synonyms: back end, rear |
| backslap | (verb) display excessive cordiality (towards) | - |
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| backslapper | (noun) someone who demonstrates enthusiastic or excessive cordiality | - |
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| backslide | (verb) drop to a lower level, as in one's morals or standards | Synonyms: lapse |
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| backslider | (noun) someone who lapses into previous undesirable patterns of behavior | Synonyms: recidivist, reversionist |
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| backsliding | (noun) a failure to maintain a higher state | Synonyms: lapse, lapsing, relapse, relapsing, reversion, reverting |
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| backspace | (noun) the typewriter key used for back spacing | Synonyms: backspace key, backspacer |
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| (verb) hit the backspace key on a computer or typewriter keyboard | - |
| backspacer | (noun) the typewriter key used for back spacing | Synonyms: backspace, backspace key |
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| backspin | (noun) spin (usually of a moving ball) that retards or reverses the forward motion | - |
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| backstage | (adjective) concealed from public view or attention | Synonyms: offstage |
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| (noun) a stage area out of sight of the audience | Synonyms: offstage, wing |
| (adverb) in or to a backstage area of a theater | - |
| (adverb) out of view of the public; behind the scenes | - |
| backstair | (adjective) secret and sly or sordid | Synonyms: backstairs, furtive |
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| backstairs | (adjective) secret and sly or sordid | Synonyms: backstair, furtive |
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| (noun) a second staircase at the rear of a building | - |
| backstay | (noun) a stay that supports the back of something | - |
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| backstitch | (noun) an overlapping stitch made by starting the next stitch at the middle of the preceding one | - |
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| (verb) do backstitches | - |
| backstop | (noun) a precaution in case of an emergency | - |
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| (noun) (baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field | - |
| (noun) (baseball) the person who plays the position of catcher | Synonyms: catcher |
| (verb) act as a backstop | - |
| backstroke | (noun) a swimming stroke that resembles the crawl except the swimmer lies on his or her back | - |
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| (verb) swim on one's back | - |
| backstroker | (noun) someone who swims the backstroke | - |
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| backswept | (adjective) used of hair | Synonyms: sweptback |
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| backswimmer | (noun) predaceous aquatic insect that swims on its back and may inflict painful bites | Synonyms: Notonecta undulata |
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| backsword | (noun) a sword with only one cutting edge | - |
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| (noun) a stick used instead of a sword for fencing | Synonyms: fencing stick, singlestick |
| blackseed | (noun) grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus | Synonyms: carpet grass, smut grass, Sporobolus poiretii |
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| blacksmith | (noun) a smith who forges and shapes iron with a hammer and anvil | - |
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| blacksnake | (noun) blackish racer of the eastern United States that grows to six feet | Synonyms: black racer, Coluber constrictor |
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| (noun) large harmless shiny black North American snake | Synonyms: black rat snake, Elaphe obsoleta, mountain blacksnake, pilot blacksnake |
| cracksman | (noun) a thief who breaks open safes to steal valuable contents | Synonyms: safebreaker, safecracker |
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| hacksaw | (noun) saw used with one hand for cutting metal | Synonyms: hack saw, metal saw |
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| jacks | (noun) a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball | Synonyms: jackstones, knucklebones |
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| jackscrew | (noun) screw-operated jack | Synonyms: screw jack |
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| jacksmelt | (noun) a relatively large silversides of the Pacific coast of North America (known to reach 18 inches in length) | Synonyms: Atherinopsis californiensis |
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| jacksnipe | (noun) American sandpiper that inflates its chest when courting | Synonyms: Calidris melanotos, pectoral sandpiper |
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| (noun) a small short-billed Old World snipe | Synonyms: half snipe, Limnocryptes minima |
| jackstones | (noun) a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball | Synonyms: jacks, knucklebones |
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| (noun) game equipment consisting of one of several small six-pointed metal pieces that are picked up while bouncing a ball in the game of jacks | Synonyms: jack |
| jackstraw | (noun) a thin strip of wood used in playing the game of jackstraws | Synonyms: spillikin |
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| jackstraws | (noun) a game in which players try to pick each jackstraw (or spillikin) off of a pile without moving any of the others | Synonyms: spillikins |
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| packsack | (noun) a bag carried by a strap on your back or shoulder | Synonyms: back pack, backpack, haversack, knapsack, rucksack |
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| packsaddle | (noun) a saddle for pack animals to which loads can be attached | - |
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| slacks | (noun) (used in the plural) pants for casual wear | - |
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| stacks | (noun) storage space in a library consisting of an extensive arrangement of bookshelves where most of the books are stored | - |
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| (noun) a large number or amount | Synonyms: dozens, gobs, heaps, lashings, loads, lots, oodles, piles, rafts, scads, scores, slews, tons, wads |