Phrase of the day

Discover a new phrase each day to use in your English! These are special phrases and sayings that English speakers use all the time, but you don't often see these phrases in English course books or other study material. Visit daily to learn some popular English phrases on a regular basis.
19th June 2018

A deal's a deal !

We use this expression to point out that somebody has to keep a promise that they made earlier
Usage
Written: 
Yes
Spoken: 
Yes
Formal: 
No
Informal: 
Yes
Example 1
I'm sorry I can't do that cleaning that I said I would do for you tonight.
Oh come on! A deal's a deal. I helped you with your homework.
Okay, you're right. I'll do it right now.
Example 2
Charlie, don't forget you have to buy chocolate cake for the whole class because your mobile rang in the lesson.
Yes you're right. A deal's a deal. We did all agree to do this.
When are you going to buy it?