We use this expression to agree with an idea suggested by someone else.
You can use this phrase in ………… language.
Spoken
Written
Informal
Example 1
A: Can we meet up at 9, not 8? I’ve got lots to do before we go out.
B: Fine by me.
Example 2
A: Shall we order one XXL menu and share it? It’ll be cheaper.
B: Fine by me. I’m not too hungry.