antagonize, be antipathetic, be inimical, beat against, clash, collide, conflict, conflict with, confute, contradict, contrapose, contravene, counter, counteract, counterattack, counterpose, countervail, counterwork, cross, go against, go counter to, interfere with, lock horns, meet head-on, militate against, oppose, oppugn, resist, run against, run counter to, swim upstream