the one that is higher in quality, more suitable etc when you are comparing two similar people or things:
It's hard to decide which one's the better.
if your feelings or wishes get the better of you, they make you behave in a way you would not normally behave:
My curiosity finally got the better of me and I opened the letter.
I think her nerves got the better of her.
to defeat someone or deal successfully with a problem
in a way that improves the situation:
a definite change for the better
The President's fortunes seem, at last, to have taken a turn for the better (=started to improve).
used to say that something would be even better or bring even more advantages:
If they can do them both at the same time, then so much the better.
to be improved by a particular action, change etc:
I think it's all the better for that extra ten minutes' cooking.
used to say that something must be accepted, whether it is good or bad, because it cannot be changed:
Work is, for better or worse, becoming more flexible nowadays.
people who are more important than you or deserve more respect