shǒu​kǒu​rú​píng

tight-lipped

Senses

守口如瓶 shǒu​kǒu​rú​píng tight-lipped

to guard one's mouth like a closed bottle; to keep a secret and reveal nothing

References

variant 守口如瓶/守口如瓶 缄口如瓶/緘口如瓶
antonym 夸夸其谈/誇誇其談 守口如瓶/守口如瓶
see 防意如城/防意如城 守口如瓶/守口如瓶