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ему рот

his mouth

→ он
phrase Rare #38,726
his mouth Russian uses the dative pronoun ему (literally “to him”) to indicate whose mouth it is; the exact person depends on context.
RU: Доктор попросил пациента открыть ему рот.
EN: The doctor asked the patient to open his mouth.

Слышь Саймон, на закрой ему рот.

Hey, Simon, shut him up.

— Dead Man's Bluff (2005)

Я открою ему рот.

I will open his mouth.

— Скафандр и бабочка (2007)

Открой ему рот.

Open his mouth.

— Анатомия падения (2023)

Пожалуйста, открой ему рот.

Please open his mouth.

— Принцесса-невеста (1987)