What is Cramp ?
Cramp is (noun) a pain in a tight muscle which will not relax He went swimming and got cramp in the cold water. She woke up with cramp in her right leg. Synonym spasm(verb) to cramp someone’s style to stop someone doing what he wants, or developing Having my mother-in-law for Christmas tends to cramp ourstyle a bit.
source: Easier English, Student Dictionary Upper Intermediate Level