English Thesaurus
(verb) 
Definition
to be of the correct size or shape (for)
Always buy clothes that fit you properly.
Synonyms
be the right size (for)
,
be the right shape for
(verb) 
Definition
to adjust in order to make appropriate
She was having her wedding dress fitted.
Synonyms
adapt
Shelves were built to adapt the library for use as an office.
,
fashion
A hat fashioned to flatter the face.
, ,
arrange
The songs were arranged by a well-known pianist.
,
alter
They have never altered their programmes.
,
tailor
scripts tailored to American comedy audiences
,
adjust
Liz adjusted her mirror and edged the car out.
,
modify
They agreed to modify their recruitment policy.
,
tweak (informal)
The system should get better as engineers tweak its performance.
,
customize
(verb) 
She fitted her key in the lock.
Synonyms
place
Chairs were placed in rows for the parents.
,
position
Position trailing plants near the edges of the basket.
,
insert
He took a key from his pocket and inserted it into the lock.
(verb) 
Fit hinge bolts to give support to the door lock.
Synonyms
attach
Attach labels to things before you file them away.
,
join
The opened link is used to join the two ends of the chain.
,
connect
Connect the machine to the mains.
,
interlock
The tragedies begin to interlock.
(verb) 
Definition
to correspond with the facts or circumstances
She doesn't fit the description of the suspect.
Synonyms
suit
I don't think a sedentary life would altogether suit me.
, ,
match
We want to match each other's outfits.
,
belong to
,
agree with
,
go with
,
conform to
,
correspond to
,
accord with
,
be appropriate to
,
concur with
,
tally with
,
dovetail with
,
be consonant with
(verb) 
Definition
to make competent or ready
His experience fits him for the top job.
Synonyms
qualify
The course does not qualify you to practise as a therapist.
,
train
a lawyer who has trained with a good quality City firm
,
prepare
It is a school's job to prepare students for university studies.
,
equip
Our aim is to provide courses which equip students for future employment.
,
empower
The trustees of the museum are empowered to sell items from its collection.
,
make ready
I'll have a room made ready for him.
(verb) 
Definition
to make competent or ready
The bombs were fitted with time devices.
Synonyms
equip
The country did not have the funds to equip the reserve army properly.
,
provide
I will be happy to provide you with a copy of the report.
They did not provide any food.
,
arm
She armed herself with all the knowledge she could gather.
,
prepare
The crew has been preparing the ship for storage.
,
outfit
Homes can be outfitted with security lights for a few hundred dollars.
,
accommodate
She walked slowly to accommodate herself to his pace.
,
fit out
,
kit out
,
rig out
,
accoutre
(adjective) 
Definition
worthy or suitable
You're not fit to be in charge of this company.
Synonyms
appropriate
It is appropriate that Irish names dominate the list.
,
qualified
Demand has far outstripped supply of qualified teachers.
,
suitable
She had no other dress suitable for the occasion.
,
competent
I don't feel competent to deal with a medical emergency.
,
right
Make sure you approach it in the right way.
,
becoming
This behaviour is not becoming among our politicians.
,
meet (archaic)
,
seemly
It wasn't seemly for them to be seen together.
,
trained
,
able
They are bright, intelligent, able and confident.
, ,
fitting
The President's address was a fitting end to the campaign.
, , , ,
correct
They refuse to adopt the rules of correct behaviour.
, , ,
adapted
,
proper
Please ensure that the proper procedures are followed.
,
equipped
,
good enough
, , , ,
apt
The words of this report are as apt today as they were in 1929.
,
well-suited
,
expedient
It might be expedient to keep this information to yourself.
,
apposite
Recent events have made his central theme even more apposite.
Opposites
(adjective) 
Definition
in good health
It will take a very fit person to beat me.
Synonyms
healthy
She had a normal pregnancy and delivered a healthy child.
,
strong
It took me a long while to feel well and strong again.
,
robust
His robust physique counts for much in the modern game.
, ,
well
I hope you're well.
, , ,
hale (old-fashioned)
looking hale and hearty
,
in good shape
,
in good condition
,
in good health
,
toned up
,
as right as rain
,
in good trim
,
able-bodied
All able-bodied men between eighteen and forty had been drafted.
Opposites
, , ,
out of shape
,
in poor condition
,
out of trim

Phrasal verbs

See fit in
(noun) 
Definition
a sudden attack or convulsion, such as an epileptic seizure
Once a fit has started there's nothing you can do to stop it.
Synonyms
seizure
I was prescribed drugs to control seizures.
,
attack
It brought on an attack of asthma.
, ,
spasm
He felt a spasm of fear.
,
convulsion
He fell to the floor in the grip of an epileptic convulsion.
,
paroxysm
She was overcome by a paroxysm of grief.
(noun) 
Definition
a sudden short burst or spell
I broke into a fit of giggles.
Synonyms
bout
I was suffering with a bout of nerves.
,
burst
short bursts of activity
,
outbreak
an outbreak of violence involving hundreds of youths
This outbreak of flu is no worse than normal.
,
outburst
an outburst of anger
,
spell
There has been a spell of dry weather.

idioms

See have a fit

Additional synonyms

in the sense of able
Definition
capable or talented
They are bright, intelligent, able and confident.
in the sense of able-bodied
Definition
strong and healthy
All able-bodied men between eighteen and forty had been drafted.
Synonyms
fit,
hale (old-fashioned),
right as rain (British, informal),
Herculean,
fighting fit,
fit as a fiddle
in the sense of accommodate
Definition
to adjust or become adjusted; to adapt
She walked slowly to accommodate herself to his pace.

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Video: pronunciation of 'fit'

Source

Thesaurus for fit from the Collins English Thesaurus
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