v. be against; express opposition to; "We oppose the ban on abortion"

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. contrast with equal weight or force