Webster's English Dictionary

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impeach

1. im.peach \im-'pe-ch\ \-'pe--ch*-b*l\ \-'pe-ch-m*nt\ vt [ME empechen, fr. 
   MF empeechier to hinder, fr. LL impedicare]to fetter, fr. L in- + pedica 
   fetter, fr. ped-, pes foot - more at FOOT 1a: to bring an accusation 
   against  1b: to charge with a crime or misdemeanor; specif : to charge (a p 
   ublic official) before a competent tribunal with misconduct in office 2: to 
   call in question; esp : to challenge the credibility or vali dity of {~ the 
   testimony of a witness} - im.peach.able aj
2. impeach n obs  : IMPEACHMENT