Main Entry: an·tag·o·nize Variant: also Britishan·tag·o·nise/an-'tag-&-"nIz/ Function: transitiveverb Inflected Forms: -nizedalso British-nised; -niz·ingalso British-nis·ing : to act in antagonism to :COUNTERACT antagonized by atropine —Ernest Bueding & Harry Most>