"opposing" in the verb sense
1. oppose
be against express opposition to
"We oppose the ban on abortion"
2. fight, oppose, fight back, fight down, defend
fight against or resist strongly
"The senator said he would oppose the bill"
"Don't fight it!"
3. oppose, counterbalance
contrast with equal weight or force
4. 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"
5. react, oppose
act against or in opposition to
"She reacts negatively to everything I say"
6. oppose, controvert, contradict
be resistant to
"The board opposed his motion"
"opposing" in the adjective sense
1. opponent, opposing
characterized by active hostility
"opponent (or opposing) armies"
Source: WordNet® (An amazing lexical database of English)
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