Pronunciation: (im-pēch'), [key]
1. to accuse (a public official) before an appropriate tribunal of misconduct in office.
2. Chiefly Law.to challenge the credibility of: to impeach a witness.
3. to bring an accusation against.
4. to call in question; cast an imputation upon: to impeach a person's motives.
5. to call to account.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.