oppose -- (be against; express opposition to; "We oppose the ban on abortion")
fight, oppose, fight back, fight down, defend -- (fight against or resist strongly; "The senator said he would oppose the bill"; "Don't fight it!")
oppose, counterbalance -- (contrast with equal weight or force)
pit, oppose, match, play off -- (set into opposition or rivalry; "let them match their best athletes against ours"; "pit a chess player against the Russian champion"; "He plays his two children off against each other")
react, oppose -- (act against or in opposition to; "She reacts negatively to everything I say")
oppose, controvert, contradict -- (be resistant to; "The board opposed his motion")