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Phrase(s): Do not let the sun go down on your wrath. [and] Do not let the sun go down on your anger.
Prov. Do not stay angry with anybody; calm your anger by the end of the day. • Son: Billy broke my bicycle, and I’m never going to speak to him again. Mother: Now, now, don’t let the sun go down on your wrath. • I was very upset by what you did, but I don’t want to let the sun go down on my anger. Let’s make up.
McGrawhill's American Idioms And Phrasal Verbs