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Phrase(s): Forgive and forget.
Prov. You should not only forgive people for hurting you, you should also forget that they ever hurt you. • When my sister lost my favorite book, I was angry at her for weeks, but my mother finally convinced me to forgive and forget. • Jane: Are you going to invite Sam to your party? Sue: No way. Last year he laughed at my new skirt. Jane: Come on, Sue, forgive and forget.
McGrawhill's American Idioms And Phrasal Verbs
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Both pardon and hold no resentment concerning a past event. For example, After Meg and Mary decided to forgive and forget their differences, they became good friends. This phrase dates from the 1300s and was a proverb by the mid-1500s. For a synonym, see LET BYGONES BE BYGONES.
American Heritage Idioms