op·pugn (ə-pyōōn') tr.v.
op·pugned, op·pugn·ing, op·pugns To oppose, contradict, or call into question.
[Middle English oppugnen, from Latin oppugnāre, to attack : ob-, against; see ob- + pugnāre, to fight with the fist; see peuk- in Indo-European roots.] op·pugn'er n.