Meaning of “fit” - Learner’s Dictionary

fit

adjective uk us /fɪt/ (fitter, fittest)
SUITABLE

of a good enough quality or suitable type for a particular purpose:

[ + to do sth ] Is this water fit to drink?
She's not in a fit state to drive.
HEALTH

A2 healthy, especially because you exercise regularly:

He's very fit for his age.
→ Opposite unfit
do sth as you see/think fit

to do something that you feel is the right thing to do, although other people might disapprove:

You must spend the money as you see fit.

(Definition of “fit adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)