Call into question the integrity or validity of (a practice).
British: Charge (someone) with treason or another crime against the state.
US: Charge (the holder of a public office) with misconduct.
“The most popular tactic is to impeach the credibility of the victim.”
“The physician’s testimony might be impeached, and the report thereby discredited.”
Manage to obtain (something, or information) by using persuasion or guile: Steal (something) in a violent robbery or raid.
With its origin coming from the French blaguer ‘tell lies’ this word is also used as a noun: An act of using persuasion or guile to obtain something: A violent robbery or raid.