call it a day
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.
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Source: A Dictionary of American Idioms