To oppose is to disapprove of or be against something.(verb)
An example of oppose is when you do not want a new bill to pass.
See oppose in Webster's New World College Dictionary
Origin: ME opposen < OFr opposer, altered (infl. by poser: see pose) < L opponere: see opponent
See oppose in American Heritage Dictionary 4
verb op·posed, op·pos·ing, op·pos·es verb, transitive
Origin: Middle English opposen, to question, interrogate
Origin: , from Old French opposer
Origin: , alteration (influenced by poser, to place)
Origin: of Latin oppōnere, to oppose (ob-, against; see ob- + pōnere, to put; see apo- in Indo-European roots).
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