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From The Collaborative International Dictionary of English v.0.48:
Impugn \Im*pugn"\, v. t. [imp. & p. p. Impugned; p. pr. & vb. n. Impugning.] [OE. impugnen, F. impugner, fr. L. impugnare; in on, against + pugnare to flight. See Pugnacious.] To attack by words or arguments; to contradict; to assail; to call in question; to make insinuations against; to gainsay; to oppose; as, to impugn a person's integrity. [1913 Webster] The truth hereof I will not rashly impugn, or overboldly affirm. --Peacham. [1913 Webster]