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Verb: call it a day
Usage: informal
  1. Stop doing what one is doing
    "At midnight, the student decided to call it a day and closed his books";
    - call it quits [informal]

Derived forms: calls it a day, called it a day, calling it a day

Type of: break, break off, cease, discontinue, give up, lay off, quit, stop, surcease [archaic]