(v. t.) To fight against; to attack; to be in conflict with; to oppose; to resist.

antagonize battle be antipathetic be at cross-purposes be contrary to be inimical be opposed to beat against belie call into question challenge clash collide conflict conflict with confute contest contradict contrapose contrast with contravene controvert counter counteract counterattack counterbalance countercheck counterpoise counterpose countervail counterwork cross deny fight gainsay go against go counter to interfere with juxtapose in opposition lock horns meet head-on militate against negate offset oppose play at cross-purposes rebut reject resist run against run counter to set off swim upstream traverse tug war work against