im·peach / imˈpēch/ • v. [tr.] call into question the integrity or validity of (a practice): there is no basis to Searle's motion to impeach the verdict. ∎  charge (the holder of a public office) with misconduct: the governor served only one year before being impeached and convicted for fiscal fraud. ∎ Brit. charge with treason or another crime against the state.DERIVATIVES: im·peach·a·ble adj.im·peach·ment n.

IMPEACH

To accuse; to charge a liability upon; to sue. To dispute, disparage, deny, or contradict; as in to impeach a judgment or decree, or impeach a witness; or as used in the rule that a jury cannot impeach its verdict. To proceed against a public officer for crime or misfeasance, before a proper court, by the presentation of a written accusation calledarticles of impeachment.

In the law of evidence, the testimony of a witness is impeached by earlier statements that the witness has made if they are inconsistent with the statements to which the witness testifies.

impeach †impede; accuse, charge XIV; charge with a high misdemeanour; call in question, disparage XVI. ME. empe(s)che — OF. empe(s)cher (mod. empêcher prevent) :- late L. impedicāre catch, entangle, f. IM-1 + pedica FETTER.
So impeachment XIV.