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opposite prompt
opposite sex
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opposition research
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oppugn

op·pugn [ ə pyn ] (past and past participle op·pugned, present participle op·pugn·ing, 3rd person present singular op·pugns)


transitive verb 
Definition:
 
query truth of: to question the validity or truthfulness of something ( formal )

[15th century. < Latin oppugnare "fight against" < pugnare "to fight"]

op·pugn·er noun
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