Etymology
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oppugn (v.)

"fight against, oppose, resist," early 15c., from Latin oppugnare "to fight against, attack, assail," from assimilated form of ob "toward, against" (see ob-) + pugnare "to fight" (see pugnacious). Related: Oppugned; oppugning; oppugnancy; oppugnant; oppugnation.

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Definitions of oppugn

oppugn (v.)
challenge the accuracy, probity, or propriety of;
Synonyms: question / call into question
From wordnet.princeton.edu