Call it a day

Call it a day Meaning/Usage: Used to express that the work day is over. Explanation: "Call it" is often times used to make a decision.  When you add "day" to this, then a person is making a decision to say that the day is over.  This is mostly used to end a working day. "Let's call it a day.  I'm too tired to continue working." "We can't continue working without Mike, so let's call it a day." "It's already nine o'clock.  Let's call it a day." A:  "How much more work do we have for tonight?" B:  "I think we finished everything for the day." A:  "Good.  Let's call it a day then." Other Common Sentences "Let's turn in for the night." "I think we should pick it up from the morning." pick it up = continue