| 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 |