Korean Idioms: 입이 무겁다/ 입이 가볍다

입이 무겁다 [ibi mugeobda]
Literal meaning: The mouth (or lips) is heavy
Translation: to hold secrets well
입 [ib]: mouth
이 [i]: (consonant +) subject marker
무겁다 [mugeobda]: heavy

A: 이거 비밀이야. 아무한테도 말하면 안돼!
[igeo bimiriya amuhantedo malhamyeon andwe]
It’s a secret. Do not tell to anybody!
B: 걱정마.. 나 입 무거워.
[geokjeongma na ib mugeoweo]
No worries.. I’m very tight-lipped.

입이 가볍다 [ibi gabyeobda]/ 입이 싸다 [ibi ssada]
Literal meaning: The mouth (or lips) is light/ cheap
Translation: to tell secrets easily, not to be able to keep a secret
입 [ib]: mouth
이 [i]: (consonant +) subject marker
가볍다 [gabyeobda]: light
싸다 [ssada]: cheap

A: 수진이에게만 비밀을 말했는데 이젠 우리반 애들이 모두 알고있어..
[sujiniegeman bimireul malhenneunde ijen uriban edeuri modu algoisseo]
I told the secret only to Sujin, but now all my classmates know about it..
B: 걔 입 진짜 가볍다!
[gye ib jinjja gabyeobda]
She has a big mouth!
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