Definitions

1. verb

to release a clenched hand, fist, or jaw; to relax a tense or rigid position

“She unclenched her fists after she had finished arguing with her brother.”

2. verb, transitive

to cause something to lose a tense or rigid position

“The warm bath unclenched her tight muscles.”

3. verb, intransitive

to relax, especially after a period of tension

“After a few minutes, she began to unclench and laugh.”