Merriam-Webster Online Dictionary

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2 entries found for impeach.
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Main Entry: 1im·peach
Pronunciation: im-'pEch
Function: transitive verb
Etymology: Middle English empechen, from Anglo-French empecher, enpechier to ensnare, impede, prosecute, from Late Latin impedicare to fetter, from Latin in- + pedica fetter, from ped-, pes foot -- more at FOOT
Date: 14th century
1 a : to bring an accusation against b : to charge with a crime or misdemeanor; specifically : to charge (a public official) before a competent tribunal with misconduct in office c : to remove from office especially for misconduct
2 : to cast doubt on; especially : to challenge the credibility or validity of <impeach the testimony of a witness>
- im·peach·able /-'pE-ch&-b&l/ adjective
- im·peach·ment /-'pEch-m&nt/ noun