Select the most appropriate meaning of the given idiom.

Call it a day

Stop working on something

The most appropriate meaning of the given idiom "call it a day" is (4) Stop working on something.

The idiom "call it a day" means to stop working or doing something for the day. It is often used when someone is tired or has been working for a long time.

The other options do not fit the meaning of the idiom.

• Call it as a bad day means to say that the day was not good.
• Stop thinking in daytime means to stop thinking about something during the day.
• Call it as a good and productive day means to say that the day was good and productive.