| backdown | (noun) a retraction of a previously held position | Synonyms: climb-down, withdrawal |
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| beardown | (adjective) with full strength | - |
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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 |
| clampdown | (noun) sudden restriction on an activity | - |
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| closedown | (noun) termination of operations | Synonyms: closing, closure, shutdown |
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| comedown | (noun) decline to a lower status or level | - |
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| countdown | (noun) counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle) | - |
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| crackdown | (noun) severely repressive actions | - |
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| down | (adjective) being or moving lower in position or less in some value | - |
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| (adjective) filled with melancholy and despondency | Synonyms: blue, depressed, dispirited, down in the mouth, downcast, downhearted, gloomy, grim, low-spirited, low |
| (adjective) extending or moving from a higher to a lower place | Synonyms: downward |
| (adjective) becoming progressively lower | - |
| (adjective) not functioning (temporarily or permanently) | - |
| (adjective) lower than previously | Synonyms: depressed |
| (adjective) shut | - |
| (adjective) being put out in a game of baseball | - |
| (adjective) understood perfectly | Synonyms: down pat, mastered |
| (noun) (American football) a complete play to advance the football | - |
| (noun) soft fine feathers | Synonyms: down feather |
| (noun) fine soft dense hair (as the fine short hair of cattle or deer or the wool of sheep or the undercoat of certain dogs) | Synonyms: pile |
| (noun) (usually plural) a rolling treeless highland with little soil | - |
| (adverb) spatially or metaphorically from a higher to a lower level or position | Synonyms: downward, downwardly, downwards |
| (adverb) away from a more central or a more northerly place | - |
| (adverb) paid in cash at time of purchase | - |
| (adverb) in an inactive or inoperative state | - |
| (adverb) to a lower intensity | - |
| (adverb) from an earlier time | - |
| (verb) improve or perfect by pruning or polishing | Synonyms: fine-tune, polish, refine |
| (verb) bring down or defeat (an opponent) | - |
| (verb) drink down entirely | Synonyms: belt down, bolt down, drink down, kill, pop, pour down, toss off |
| (verb) eat up completely, as with great appetite | Synonyms: consume, demolish, devour, go through |
| (verb) cause to come or go down | Synonyms: cut down, knock down, pull down, push down |
| (verb) shoot at and force to come down | Synonyms: land, shoot down |
| eiderdown | (noun) down of the eider duck | - |
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| (noun) a soft quilt usually filled with the down of the eider | Synonyms: continental quilt, duvet |
| godown | (noun) (in India and Malaysia) a warehouse | - |
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| knockdown | (adjective) (furniture) easily assembled and dismantled | - |
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| (noun) a blow that knocks the opponent off his feet | - |
| letdown | (noun) a feeling of dissatisfaction that results when your expectations are not realized | Synonyms: disappointment |
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| lockdown | (noun) the act of confining prisoners to their cells (usually to regain control during a riot) | - |
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| lookdown | (noun) similar to moonfish but with eyes high on the truncated forehead | Synonyms: lookdown fish, Selene vomer |
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| meltdown | (noun) a disaster comparable to a nuclear meltdown | - |
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| (noun) severe overheating of the core of a nuclear reactor resulting in the core melting and radiation escaping | Synonyms: nuclear meltdown |
| rubdown | (noun) the act of rubbing down, usually for relaxation or medicinal purposes | - |
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| rundown | (noun) a concluding summary (as in presenting a case before a law court) | Synonyms: summation, summing up |
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| shakedown | (adjective) intended to test a new system under operating conditions and to familiarize the operators with the system | - |
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| (noun) extortion of money (as by blackmail) | - |
| (noun) a very thorough search of a person or a place | - |
| (noun) initial adjustments to improve the functioning or the efficiency and to bring to a more satisfactory state | - |
| showdown | (noun) a hostile disagreement face-to-face | Synonyms: confrontation, encounter, face-off |
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| shutdown | (noun) termination of operations | Synonyms: closedown, closing, closure |
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| slowdown | (noun) the act of slowing down or falling behind | Synonyms: lag, retardation |
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| spelldown | (noun) a contest in which you are eliminated if you fail to spell a word correctly | Synonyms: spelling bee, spelling contest |
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| splashdown | (noun) a landing of a spacecraft in the sea at the end of a space flight | - |
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| standdown | (noun) (military) a temporary stop of offensive military action | Synonyms: stand-down |
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| (noun) a suspension and relaxation from an alert state or a state of readiness | Synonyms: stand-down |
| sundown | (noun) the time in the evening at which the sun begins to fall below the horizon | Synonyms: sunset |
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| takedown | (noun) a crushing remark | Synonyms: put-down, squelch, squelcher |
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| (noun) (amateur wrestling) being brought to the mat from a standing position | - |
| thistledown | (noun) pappus of a thistle consisting of silky featherlike hairs attached to the seed-like fruit of a thistle | - |
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| touchdown | (noun) a score in American football; being in possession of the ball across the opponents' goal line | - |
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| (noun) a landing (as the wheels touch the landing field); especially of airplanes | - |
| turndown | (noun) the act of refusing an offer | Synonyms: nonacceptance |
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