[Korean Idiom]입이 무겁다

[입이 무겁다]

Literal meaning : Mouth is heavy
Actual meaning : keep a secret (one's lips are sealed)

입 [ip] : mouth
무겁다 [mu-geop-da] : heavy

ex) A : 이거 비밀이야. 아무한테도 말하지마!
B: 걱정 하지마. 나 입 무거워.
A : This is a secret. Don't tell anyone!
B : Don't worry about it. My lips are sealed.

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