fit

1 fit /ˈfɪt/ adjective
fitter; fittest
1 fit
/ˈfɪt/
adjective
fitter; fittest
Britannica Dictionary definition of FIT
1 
a  : proper or acceptable : morally or socially correct — often + for
— often followed by to + verb
b  : suitable for a specified purpose — often + for
— often followed by to + verb
2 
a  : physically healthy and strong
b  British slang : sexually attractive : sexy
3 
: having the necessary skills — usually + for
4 
: made ready : put in a suitable state — usually + for

fit as a fiddle

informal also British fit as a flea
: in good physical condition : very healthy and strong

fit for a king

: good enough even for a king : very good

fit to be tied

informal
: very angry or upset

fit to burst

chiefly British, informal

fit to kill

US, informal
: in an impressive way that attracts attention

see/think fit

◊ To see fit or think fit to do something is to choose to do it because you think it is right or appropriate.

— fitness

noun [noncount]
2 fit /ˈfɪt/ verb
fits; fitted or chiefly US fit; fitting
2 fit
/ˈfɪt/
verb
fits; fitted or chiefly US fit; fitting
Britannica Dictionary definition of FIT
1 
not used in progressive tenses : to be the right size and shape for (someone or something)
[+ object]
[no object]
◊ Something that fits (you) like a glove fits (you) very well.
◊ The phrase one size fits all describes a hat, piece of clothing, etc., that is made in a size that is supposed to fit everyone. This phrase is commonly used figuratively.
2 
not used in progressive tenses
a  [no object] : to go into or through a particular space
b  [+ object] : to cause (something) to go into or through a particular space
3 
[+ object] past tense and past participle fitted
a  : to measure (someone) in order to choose clothes that are the right size and shape for that person — usually used as (be) fitted
b  : to change the shape or form of (a piece of clothing) for a particular person
4 
[+ object] : to find time to meet with (someone) or do (something) — usually + in or into
5 
[no object] : to belong in a particular situation, place, or group
— usually + in
6 
not used in progressive tenses [+ object]
a  : to be suitable or appropriate for (someone or something)
b  : to make (someone or something) suitable or appropriate for or to something
7 
not used in progressive tenses, [+ object] : to be in agreement with (something or someone)
8 
[+ object] past tense and past participle fitted : to supply equipment for (something)
— often + out or up

fit the bill

— see 1bill

if the cap fits

— see 1cap

if the shoe fits

— see 1shoe

— fitter

/ˈfɪtɚ/ noun, plural fitters [count]
— see also pipe fitter
3 fit /ˈfɪt/ noun
plural fits
3 fit
/ˈfɪt/
noun
plural fits
Britannica Dictionary definition of FIT
[count]
: the way something fits : the way something suits the size and shape of your body or goes into or through a particular space
4 fit /ˈfɪt/ noun
plural fits
4 fit
/ˈfɪt/
noun
plural fits
Britannica Dictionary definition of FIT
[count]
1 
: an uncontrolled expression of strong emotion
2 
: a sudden occurrence of some activity, emotion, etc.
3 
: an abnormal state in which you become unconscious and your body moves in an uncontrolled and violent way

by fits and starts

or in fits and starts
: by stopping and starting again : in a way that is not constant or steady

in fits

British, informal
: laughing very much : in fits of laughter