Open English Wordnet
Verbs
(v)opposebe against; express opposition to“We oppose the ban on abortion” (v)pit, oppose, match, play offset 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)react, opposeact against or in opposition to“She reacts negatively to everything I say”