| quack | (verb) act as a medical quack or a charlatan | - |
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| (verb) utter quacking noises | - |
| quadruple | (verb) increase fourfold | - |
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| quadruplicate | (verb) reproduce fourfold | - |
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| quaff | (verb) to swallow hurriedly or greedily or in one draught | Synonyms: gulp, swig |
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| quail | (verb) draw back, as with fear or pain | Synonyms: cringe, flinch, funk, recoil, shrink, squinch, wince |
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| quake | (verb) shake with fast, tremulous movements | Synonyms: palpitate, quiver |
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| (verb) shake with seismic vibrations | Synonyms: tremor |
| qualify | (verb) make fit or prepared | Synonyms: dispose |
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| (verb) add a modifier to a constituent | Synonyms: modify |
| (verb) make more specific | - |
| (verb) specify as a condition or requirement in a contract or agreement; make an express demand or provision in an agreement | Synonyms: condition, specify, stipulate |
| (verb) describe or portray the character or the qualities or peculiarities of | Synonyms: characterise, characterize |
| (verb) pronounce fit or able | - |
| (verb) prove capable or fit; meet requirements | Synonyms: measure up |
| quantify | (verb) express as a number or measure or quantity | Synonyms: measure |
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| (verb) use as a quantifier | - |
| quantise | (verb) apply quantum theory to; restrict the number of possible values of (a quantity) or states of (a physical entity or system) so that certain variables can assume only certain discrete magnitudes that are integral multiples of a common factor | Synonyms: quantize |
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| (verb) approximate (a signal varying continuously in amplitude) by one whose amplitude is restricted to a prescribed set of discrete values | Synonyms: quantize |
| quantize | (verb) apply quantum theory to; restrict the number of possible values of (a quantity) or states of (a physical entity or system) so that certain variables can assume only certain discrete magnitudes that are integral multiples of a common factor | Synonyms: quantise |
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| (verb) approximate (a signal varying continuously in amplitude) by one whose amplitude is restricted to a prescribed set of discrete values | Synonyms: quantise |
| quarantine | (verb) place into enforced isolation, as for medical reasons | - |
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| quarrel | (verb) have a disagreement over something | Synonyms: altercate, argufy, dispute, scrap |
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| quarry | (verb) extract (something such as stones) from or as if from a quarry | - |
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| quarter | (verb) divide by four; divide into quarters | - |
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| (verb) divide into quarters | - |
| (verb) pull (a person) apart with four horses tied to his extremities, so as to execute him | Synonyms: draw, draw and quarter |
| (verb) provide housing for (military personnel) | Synonyms: billet, canton |
| quarterback | (verb) play the quarterback | - |
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| quash | (verb) put down by force or intimidation | Synonyms: keep down, reduce, repress, subdue, subjugate |
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| (verb) declare invalid | Synonyms: annul, avoid, invalidate, nullify, void |
| quaver | (verb) sing or play with trills, alternating with the half note above or below | Synonyms: trill, warble |
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| (verb) give off unsteady sounds, alternating in amplitude or frequency | Synonyms: waver |
| queen | (verb) become a queen | - |
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| (verb) promote to a queen, as of a pawn in chess | - |
| queer | (verb) put in a dangerous, disadvantageous, or difficult position | Synonyms: endanger, expose, peril, scupper |
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| (verb) hinder or prevent (the efforts, plans, or desires) of | Synonyms: baffle, bilk, cross, foil, frustrate, scotch, spoil, thwart |
| quell | (verb) suppress or crush completely | Synonyms: quench, squelch |
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| (verb) overcome or allay | Synonyms: appease, stay |
| quench | (verb) suppress or crush completely | Synonyms: quell, squelch |
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| (verb) cool (hot metal) by plunging into cold water or other liquid | - |
| (verb) reduce the degree of (luminescence or phosphorescence) in (excited molecules or a material) by adding a suitable substance | - |
| (verb) satisfy (thirst) | Synonyms: allay, assuage, slake |
| (verb) suppress (sparking) when the current is cut off in an inductive circuit, or suppress (an oscillation or discharge) in a component or device | - |
| (verb) put out, as of fires, flames, or lights | Synonyms: blow out, extinguish, snuff out |
| query | (verb) pose a question | Synonyms: question |
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| quest | (verb) seek alms, as for religious purposes | - |
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| (verb) express the need or desire for | Synonyms: ask for, bespeak, call for, request |
| (verb) bark with prolonged noises, of dogs | Synonyms: bay |
| (verb) search the trail of (game) | - |
| (verb) make a search (for) | - |
| question | (verb) pose a question | Synonyms: query |
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| (verb) challenge the accuracy, probity, or propriety of | Synonyms: call into question, oppugn |
| (verb) place in doubt or express doubtful speculation | Synonyms: wonder |
| (verb) pose a series of questions to | Synonyms: interrogate |
| (verb) conduct an interview in television, newspaper, and radio reporting | Synonyms: interview |
| quetch | (verb) express complaints, discontent, displeasure, or unhappiness | Synonyms: complain, kick, kvetch, plain, sound off |
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| queue | (verb) form a queue, form a line, stand in line | Synonyms: line up, queue up |
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| quibble | (verb) argue over petty things | Synonyms: bicker, brabble, niggle, pettifog, squabble |
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| (verb) evade the truth of a point or question by raising irrelevant objections | - |
| quicken | (verb) give new life or energy to | Synonyms: animate, reanimate, recreate, renovate, repair, revive, revivify, vivify |
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| (verb) show signs of life | - |
| (verb) give life or energy to | Synonyms: invigorate |
| (verb) move faster | Synonyms: accelerate, speed, speed up |
| (verb) make keen or more acute | Synonyms: whet |
| quickstep | (verb) perform a quickstep | - |
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| quiesce | (verb) become quiet or quieter | Synonyms: hush, pipe down, quiet, quiet down, quieten |
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| quiet | (verb) make calm or still | Synonyms: calm, calm down, lull, quieten, still, tranquilize, tranquillise, tranquillize |
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| (verb) become quiet or quieter | Synonyms: hush, pipe down, quiesce, quiet down, quieten |
| quieten | (verb) cause to be quiet or not talk | Synonyms: hush, hush up, shut up, silence, still |
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| (verb) make calm or still | Synonyms: calm, calm down, lull, quiet, still, tranquilize, tranquillise, tranquillize |
| (verb) become quiet or quieter | Synonyms: hush, pipe down, quiesce, quiet, quiet down |
| quilt | (verb) create by stitching together | - |
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| (verb) stitch or sew together | - |
| quintuple | (verb) increase fivefold | - |
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| quip | (verb) make jokes or quips | Synonyms: gag |
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| quirk | (verb) twist or curve abruptly | - |
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| quit | (verb) give up in the face of defeat of lacking hope; admit defeat | Synonyms: chuck up the sponge, drop by the wayside, drop out, fall by the wayside, give up, throw in, throw in the towel |
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| (verb) go away or leave | Synonyms: depart, take leave |
| (verb) turn away from; give up | Synonyms: foreswear, relinquish, renounce |
| (verb) give up or retire from a position | Synonyms: leave office, resign, step down |
| (verb) put an end to a state or an activity | Synonyms: cease, discontinue, give up, lay off, stop |
| quiver | (verb) shake with fast, tremulous movements | Synonyms: palpitate, quake |
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| (verb) move with or as if with a regular alternating motion | Synonyms: beat, pulsate |
| (verb) move back and forth very rapidly | Synonyms: flicker, flitter, flutter, waver |
| quiz | (verb) examine someone's knowledge of something | Synonyms: test |
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| quote | (verb) repeat a passage from | Synonyms: cite |
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| (verb) refer to for illustration or proof | Synonyms: cite |
| (verb) put quote marks around | - |
| (verb) name the price of | - |