oppugn

oppugn verb aggress, assault, attack, be contrary, buck, call in question, challenge, clash, combat, conflict, confront, contend, contradict, contravene, controvert, counter, countervail, counterwork, criticize adversely, cross, deal a blow, defy, denounce, descend upon, disagree, dissent, fall upon, fight, foil, gainsay, go against, hold out against, interfere with, militate against, object, obstruct, oppose, outface, pounce upon, protest, reason against, recalcitrate, refute, reluct, reluctate, remonstrate, resist, run against, run counter to, set upon, side against, stand against, stand up to, strike at, strive against, take exxeption, take the offensive, thrust at, thwart, traverse, wrangle

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See also: answer, assail, assault, attack, collide, confront, contest, contradict, counteract, disaffirm, disagree, disprove, gainsay, hold out, oppose, refute, reply, repulse, resist