Tom had a leg cramp.

It's very small and cramped.

I have to go to cram school.

She had a cramp in her leg.

She goes to the cram school on weekends.

I got a cramp in my leg while swimming.

While I was swimming, I got a cramp in my leg.

Tom is now cramming for the finals.

Try not to drink too much while you're doing exercise, or you'll get cramps.

Don't cram. Whatever you cram you will quickly forget.