| impact | (verb) have an effect upon | Synonyms: affect, bear on, bear upon, touch, touch on |
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| (verb) press or wedge together; pack together | - |
| impair | (verb) make worse or less effective | - |
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| (verb) make imperfect | Synonyms: deflower, mar, spoil, vitiate |
| impale | (verb) pierce with a sharp stake or point | Synonyms: empale, spike, transfix |
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| (verb) kill by piercing with a spear or sharp pole | Synonyms: stake |
| impanel | (verb) select from a list | Synonyms: empanel, panel |
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| (verb) enter into a list of prospective jurors | Synonyms: empanel |
| impart | (verb) transmit or serve as the medium for transmission | Synonyms: carry, channel, conduct, convey, transmit |
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| (verb) transmit (knowledge or skills) | Synonyms: give, leave, pass on |
| (verb) bestow a quality on | Synonyms: add, bestow, bring, contribute, lend |
| impeach | (verb) bring an accusation against; level a charge against | Synonyms: accuse, criminate, incriminate |
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| (verb) charge (a public official) with an offense or misdemeanor committed while in office | - |
| (verb) challenge the honesty or veracity of | - |
| impede | (verb) block passage through | Synonyms: block, close up, jam, obstruct, obturate, occlude |
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| (verb) be a hindrance or obstacle to | Synonyms: hinder |
| impel | (verb) cause to move forward with force | Synonyms: propel |
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| (verb) urge or force (a person) to an action; constrain or motivate | Synonyms: force |
| impend | (verb) be imminent or about to happen | - |
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| imperil | (verb) pose a threat to; present a danger to | Synonyms: endanger, jeopardise, jeopardize, menace, peril, threaten |
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| impersonate | (verb) pretend to be someone you are not; sometimes with fraudulent intentions | Synonyms: personate, pose |
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| (verb) represent another person with comic intentions | - |
| (verb) assume or act the character of | Synonyms: portray |
| impinge | (verb) advance beyond the usual limit | Synonyms: encroach, infringe |
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| (verb) impinge or infringe upon | Synonyms: encroach, entrench, trench |
| implant | (verb) put firmly in the mind | Synonyms: plant |
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| (verb) fix or set securely or deeply | Synonyms: embed, engraft, imbed, plant |
| (verb) become attached to and embedded in the uterus | - |
| implement | (verb) pursue to a conclusion or bring to a successful issue | Synonyms: carry out, follow out, follow through, follow up, go through with, put through |
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| (verb) ensure observance of laws and rules | Synonyms: apply, enforce |
| (verb) apply in a manner consistent with its purpose or design | - |
| implicate | (verb) impose, involve, or imply as a necessary accompaniment or result | Synonyms: entail |
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| (verb) bring into intimate and incriminating connection | - |
| implode | (verb) burst inward | Synonyms: go off |
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| implore | (verb) call upon in supplication; entreat | Synonyms: beg, pray |
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| imply | (verb) express or state indirectly | Synonyms: connote |
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| (verb) suggest as a logically necessary consequence; in logic | - |
| (verb) have as a logical consequence | Synonyms: entail, mean |
| (verb) have as a necessary feature | Synonyms: involve |
| (verb) suggest that someone is guilty | Synonyms: incriminate, inculpate |
| import | (verb) indicate or signify | Synonyms: spell |
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| (verb) bring in from abroad | - |
| (verb) transfer (electronic data) into a database or document | - |
| importune | (verb) beg persistently and urgently | Synonyms: insist |
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| impose | (verb) impose something unpleasant | Synonyms: bring down, inflict, visit |
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| (verb) impose and collect | Synonyms: levy |
| (verb) compel to behave in a certain way | Synonyms: constrain, enforce |
| impound | (verb) place or shut up in a pound | Synonyms: pound |
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| (verb) take temporary possession of as a security, by legal authority | Synonyms: attach, confiscate, seize, sequester |
| impoverish | (verb) take away | Synonyms: deprive |
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| (verb) make poor | - |
| imprecate | (verb) utter obscenities or profanities | Synonyms: blaspheme, curse, cuss, swear |
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| (verb) wish harm upon; invoke evil upon | Synonyms: anathemise, anathemize, bedamn, beshrew, curse, damn, maledict |
| impregnate | (verb) make pregnant | Synonyms: bang up, knock up, prang up |
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| (verb) fertilize and cause to grow | - |
| (verb) infuse or fill completely | Synonyms: saturate |
| (verb) fill, as with a certain quality | Synonyms: infuse, instill, tincture |
| impress | (verb) dye (fabric) before it is spun | Synonyms: yarn-dye |
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| (verb) produce or try to produce a vivid impression of | Synonyms: ingrain, instill |
| (verb) mark or stamp with or as if with pressure | Synonyms: imprint |
| (verb) take (someone) against his will for compulsory service, especially on board a ship | Synonyms: shanghai |
| (verb) reproduce by printing | Synonyms: print |
| (verb) impress positively | - |
| (verb) have an emotional or cognitive impact upon | Synonyms: affect, move, strike |
| imprint | (verb) mark or stamp with or as if with pressure | Synonyms: impress |
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| (verb) establish or impress firmly in the mind | Synonyms: form |
| imprison | (verb) lock up or confine, in or as in a jail | Synonyms: gaol, immure, incarcerate, jail, jug, lag, put away, put behind bars, remand |
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| (verb) confine as if in a prison | - |
| improve | (verb) get better | Synonyms: ameliorate, better, meliorate |
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| (verb) to make better | Synonyms: ameliorate, amend, better, meliorate |
| improvise | (verb) perform without preparation | Synonyms: ad-lib, extemporise, extemporize, improvize |
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| (verb) manage in a makeshift way; do with whatever is at hand | Synonyms: extemporize |
| improvize | (verb) perform without preparation | Synonyms: ad-lib, extemporise, extemporize, improvise |
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| impugn | (verb) attack as false or wrong | - |
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| impute | (verb) attribute or credit to | Synonyms: ascribe, assign, attribute |
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| (verb) attribute (responsibility or fault) to a cause or source | - |