Nouns

(n)clinch, clencha small slip noose made with seizing
(n)clasp, clench, clutch, clutches, grasp, grip, holdthe act of grasping“he released his clasp on my arm”, “he has a strong grip for an old man”, “she kept a firm hold on the railing”

Verbs

(v)clench, clinchhold in a tight grasp“clench a steering wheel”
(v)clenchsqueeze together tightly“clench one's jaw”