Rebut is defined as to contradict or oppose.(verb)
An example of rebut is to debate against a pro choice argument in a formal debate.
See rebut in Webster's New World College Dictionary
Origin: ME rebuten < Anglo-Fr reboter < OFr rebuter < re-, back + buter, to thrust, push: see butt
See rebut in American Heritage Dictionary 4
verb re·but·ted, re·but·ting, re·buts verb, transitive
Origin: Middle English reboten, rebutte, to rebuke, repel
Origin: , from Old French rebouter
Origin: : re-, re-
Origin: + bouter, to push (of Germanic origin; see bhau- in Indo-European roots).
Learn more about rebut