to verbally end an event (like work, a party, etc)
Examples:
- It’s late. Let’s call it a day and finish painting the house tomorrow.
- I had a lot of fun tonight. Why don’t we call it a night. It’s already 3am!
- We're going to call it a day — it's been too much of a struggle for too long.
- After three hours of unproductive negotiation, both sides agreed to call it a day.
Synonyms: call it quits, wrap up, pack it in, stop for the day