The definition of accuse is to say another person is at fault for doing something wrong.(verb)
An example of accuse is to tell a spouse you think he is unfaithful.
See accuse in Webster's New World College Dictionary
See accuse in American Heritage Dictionary 4
verb ac·cused, ac·cus·ing, ac·cus·es verb, transitive
Origin: Middle English acusen
Origin: , from Latin accūsāre
Origin: : ad-, ad-
Origin: + causa, lawsuit.
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