To challenge or dispute the truth, validity, or honesty of something; to call into question someone's motives or integrity. To attack as false or questionable.
From Latin 'impugnare,' from 'in-' (against) + 'pugnare' (to fight). Literally means 'to fight against,' related to 'pugnacious' (combative) and 'repugnant' (fighting against, offensive).
Think 'im-PUGNACIOUS' — you're fighting against someone's reputation or claims. When you impugn someone's motives, you're being pugnacious (combative) toward their credibility, throwing punches at their integrity.
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