op·pugn /əˈpjun, ɑ-/
  (vt.)責難,反駁,質疑
  Op·pugn v. t. [imp. & p. p. Oppugned p. pr. & vb. n. Oppugning.]  To fight against; to attack; to be in conflict with; to oppose; to resist.
     They said the manner of their impeachment they could not but conceive did oppugn the rights of Parliament.   --Clarendon.
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  oppugn
       v : challenge the accuracy, probity, or propriety of; "We must
           question your judgment in this matter" [syn: question,
           call into question]