| 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. |
| 6. | Obsolete. impeachment. |