[call it a day] {v. phr.}
To declare that a given day's work has been accomplished and go home; to quit for the day.
* /"Let's call it a day," the boss said, "and go out for a drink."/* /It was nearly midnight, so Mrs. Byron decided to call it a day, and left the party, and went home./* /The four golfers played nine holes and then called it a day./
Compare: CLOSE UP SHOP.