Definitions

1. noun

a sudden, involuntary contraction of a muscle or a group of muscles

“She felt a sharp spasm in her back after lifting the heavy box.”

2. verb

to have or cause a sudden, involuntary contraction of a muscle or a group of muscles

“The cold water made her spasm, and she let go of the cup.”

3. noun

a sudden, uncontrolled outburst or reaction

“The audience was shocked by the politician’s sudden spasm of anger.”