Wordnet 3.0
ADJECTIVE (1)
1. 
 closed or squeezed together tightly; 
- Example: "a clenched fist"- Example: "his clenched (or clinched) teeth"[syn: clenched, clinched]
WordNet (r) 3.0 (2006):
clenched
    adj 1: closed or squeezed together tightly; "a clenched fist";
           "his clenched (or clinched) teeth" [syn: clenched,
           clinched]