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Phrase(s): Time to call it a night.
It’s time to quit one’s activities for the night. (Can refer to work or partying.) • Bob: Wow, it’s late! Time to call it a night. Mary: Yes, it’s really dark! Good night. • Fred: Gee, I’m tired. Look at the time! Jane: Yes, it’s time to call it a night.
McGrawhill's American Idioms And Phrasal Verbs