To assault, attack.
To verbally assault, especially to argue against an opinion, motive, or action; to question the truth or validity of; cast doubt on.
For quotations using this term, see Citations:impugn.
Borrowed from Middle French impugner, from Latin impugnō, from im- + pugnō (“fight”), from pugnus (“fist”), as in English pugilism (“fighting with fists, boxing”).
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