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to bite one's lip
01
to press one's teeth against the lip as a reaction to emotion, pain, or to prevent oneself from saying something
Collocation
Exemplo
The way she bit her lip said that she was holding back tears.
I accidentally bit my lip with my canines.
The child bit his lip to keep from crying after falling down.
She bites her lip to prevent herself from saying something she might regret during the argument.
Even though she was nervous, she bit her lip and gave a confident speech.