Meaning/Usage: Used after two people agree on something
Explanation: "Fair" means to be legitimate or to be in accordance with the rules. When something is fair, no cheating is happening and nobody has a better advantage. Therefore, this term became popular in spoken English to agree to something.
It's a fair enough question for me to answer.
You want a rematch because you were sick when you lost? Fair enough.
Fair enough, I will try it once to see if I like it.
A.
If you do not finish your homework you will not be able to go outside to play.