Meaning of 食い縛る in Japanese

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Definition of 食い縛る

くいしばる(kuishibaru) 【食いしばる ·食い縛る ·食縛る】

(v5r, vt) to set one's teeth; to clench one's teeth; to grit one's teeth
歯をくいしばってください。
Bite together, please.

はをくいしばる(hawokuishibaru) 【歯を食いしばる ·歯を食い縛る ·歯を食縛る】

(exp, v5r) to bear up in tragedy; to stand pain well; to hold one's temper
歯を食い縛る、喉元までせりあがった感情を強引に飲み込む。
He grits his teeth and forces back his growing fear.