Hypertext Webster Gateway: "impugn"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
The truth hereof I will net rashly pugn, or overboldly
affirm. --Peacham.
From WordNet (r) 1.7 (wn)
impugn
v : attack as false or wrong
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