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.”
Chimaera (noun) (also Chimera)
(in Greek mythology) a fire-breathing female monster with a lion’s head, a goat’s body, and a serpent’s tail. (modern biology) An organism containing a mixture of genetically different tissues, formed by processes such as fusion of early embryos, grafting, or mutation.
Late Middle English: via Latin from Greek khimaira ‘she-goat or chimaera’.