Meaning of fit in English

Adjective

1. healthy and strong

Turkey and chicken are full of protein and healthy nutrients to help keep muscles fit.

2. suitable for a particular purpose

This water is fit[good] to drink.

Verb

1. be of the right size and shape for something or someone

It doesn't fit. 
That fits me very much.

fit²

Noun

1. a sudden, sharp attack of illness

a fit of coughing

2. an outburst of emotion

have a fit of laughing