D defs.my
Entry 1 sense Webster, 1913

Oppugn

· Op·pugn · IPA /əˈpjuːn/
01 v. t. To fight against; to attack; to be in conflict with; to oppose; to resist.
imp. & p. p. Oppugned; p. pr. & vb. n. Oppugning
  1. 1.
    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.