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