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Phrase(s): It’ll all come out in the wash.
Fig. It does not matter.; No lasting damage has been done. • Tom: I feel so bad about what I said to Bill. I don’t think he’ll ever forgive me. Mary: Oh, don’t worry. It’ll all come out in the wash. • Jane: I’ll never forgive myself for losing Mary’s book. Charlie: Just tell her you’re sorry, and offer to pay for the book. It’ll all come out in the wash.
McGrawhill's American Idioms And Phrasal Verbs