입이 무겁다
그는 입이 무거워서 아무도 비밀을 말하지 않는다.
He’s good at keeping secrets, so no one tells him their secrets.
reliable in keeping confidential information; discreet
그녀는 입이 무거워서 친구들의 비밀을 절대 말하지 않는다.
She’s so discreet that she never reveals her friends’ secrets.
사장님은 입이 무거워서 직원들이 안심하고 이야기를 나눌 수 있다.
The boss is so trustworthy that employees feel comfortable talking to him.
Often used to describe someone who can be trusted not to gossip or reveal sensitive information.
Related Phrases
Pro Tip
When to use
Use '입이 무겁다' to praise someone’s discretion or to describe a situation where confidentiality is valued.
Gold Rule
Literal vs. figurative
Never confuse the idiomatic meaning ('discreet') with the literal meaning ('heavy mouth').
Word Origin
Combines '입' (mouth) and '무겁다' (heavy), metaphorically implying that the mouth is weighed down by the burden of keeping secrets.
Usage Notes
Used to describe a person’s trustworthiness in confidentiality. Not to be confused with the literal meaning of a heavy mouth.