{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.
CALL IT A DAY
Meaning of CALL IT A DAY in English
Slang English vocab. Английский сленговый словарь. 2012