|Origin:||spasme, from Latin, from Greek spasmos, from span 'to pull'|
1HB [uncountable and countable]
an occasion when your muscles suddenly become tight, causing you pain:
Maggie felt a muscle spasm in her back.
Tom's jaw muscles had gone into spasm.
a sudden strong feeling or reaction that you have for a short period of time:
I felt a spasm of fear.