| 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 |