The idiom "call it a day" means to stop working or doing something for the rest of the day. It is often used when someone has been working on a task or project for a long time and wants to take a break or finish for the day.
For example, if you have been working on a project at work for several hours and it's getting late, you might say, "Let's call it a day and finish up tomorrow." This means that you want to stop working for the day and resume the project the next day.
Another example is if you are playing a game with friends and it's getting late, you might say, "Let's call it a day and continue tomorrow." This means that you want to stop playing for the day and continue the game the next day.
In short, "call it a day" means to stop working or doing something for the rest of the day and resume it later.
• Let's call it a day and go home early, I'm too tired to work anymore.
• We were making good progress on the project, but it was getting late and we decided to call it a day and resume tomorrow.
• After several hours of hiking, we reached the summit and decided to call it a day before dark.
• The negotiations had been going on for hours, but we couldn't reach an agreement, so we decided to call it a day and reconvene next week.
• The director was not satisfied with the progress of the film shoot and decided to call it a day and reschedule for another time.
• The rain started pouring down, so we decided to call it a day and head back to the hotel.