To stop working or end an activity for the day, deciding that enough has been accomplished or that it's time to quit.
This phrase emerged in the early 20th century American workplace culture. It likely developed from the practice of workers literally calling out the end of the workday, or from supervisors announcing when the day's work was finished. The expression reflects the structured nature of industrial work schedules.
The beauty of this phrase lies in its finality and collective understanding - when someone says "let's call it a day," everyone immediately knows it's time to wrap up. It's become so universal that it transcends specific work environments and can apply to any activity, from sports practice to family projects.
Complete word intelligence in one call. Free tier — 50 lookups/day.