unclench
verb/ʌnˈklɛnt͡ʃ/
Etymology From Middle English unclenchen, equivalent to un- + clench.
1
To open (something that was clenched).
- The baby stopped crying and unclenched her fists.
- I watched her clench and unclench her fists nervously.2019, Candice Carty-Williams, Queenie, Trapeze, page 330:
2
To relax, especially one's muscles.
- Bill, take some deep breaths and unclench.