The term is often used when discussing laughter. "fits of laughter"
So to keep in fits would be to continue making someone laugh.
If you mean ''fits like a glove '' then it means that the item fits perfectlly
When a sock fits high quarter, it means that your anklebone is entirely covered.
something that fits together
Looks nice. (it fits)
The expression "If the shoe fits" means that if something suits a person then the person should "wear the shoe that fits" and accept that it suits them and works for them.
Yes, if your coughing fits are bad enough.
Do you mean 345 ?
If it fits congratulations, if it doesnt then keep looking.
The correct size of the bullet that fits the rifle.
Intuition is a word that fits that concept.
You find one that fits well, adjust the straps and keep them closed when you wear the helmet.
Hollywood squares.