English definition of “fit”
/fɪt/ adjective (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 › 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.