[v] be against; express opposition to; "We oppose the ban on abortion"
[v] be resistant to; "The board opposed his motion."
[v] 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"
[v] fight against or resist strongly; "The senator said he would oppose the bill"; "Don't fight it!"
[v] act against or in opposition to; "She reacts negatively to everything I say"
[v] place in opposition: can also be used in an abstract sense; "Oppose thy steadfast gazing eyes to mine"- Shakespeare
contradict, controvert, counterbalance, defend, fight, fight back, fight down, match, pit, play off, react, turn the scales