call it a day
stop the work that you have been doing for a while (aufhören)
"It's nearly 8 o'clock. Let's call it day and meet back here tomorrow morning."
"To call it a day" is usually what you do at the end of a work day. You've done enough for that day, and any remaining work can wait till the next day. In certain contexts, however, the expression can be used to mean you are stopping work permanently.