| 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 |