clench

(noun) a small slip noose made with seizing. Synonyms: clinch.

(noun) the act of grasping. Synonyms: clasp, clutch, clutches, grasp, grip, hold. Examples: "He released his clasp on my arm." "He has a strong grip for an old man." "She kept a firm hold on the railing."

(verb) hold in a tight grasp. Synonyms: clinch. Examples: "Clench a steering wheel."

(verb) squeeze together tightly. Examples: "Clench one's jaw."