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Phrase(s): It’s no use crying over spilled milk. [and] Don’t cry over spilled milk.
Prov. Do not be upset about making a mistake, since you cannot change that now. • I know you don’t like your new haircut, but you can’t change it now. It’s no use crying over spilled milk. • OK, so you broke the drill I lent you. Don’t cry over spilled milk.
McGrawhill's American Idioms And Phrasal Verbs