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.”
A person who inspires or influences others, especially one prominent in a particular sphere.
Late Middle English: from Old French luminarie or late Latin luminarium, from Latin lumen, lumin- ‘light’. Modern meaning comes from the more archaic meaning ‘a natural body that gives light, such as the sun or the moon.’
(archaic) a momentary sick of faint feeling. Modern usage is an uneasy feeling of doubt about one’s actions, usually used in the negative ‘no qualms’.
Early 16th century (in the sense ‘momentary sick feeling’): perhaps related to Old English cw(e)alm ‘pain’, of Germanic origin.