duō​zuǐ

speak out of turn

多嘴 duō​zuǐ
speak out of turn verb
To speak unnecessarily or when it is not one's place to do so; to blab or meddle in others' affairs.

This is someone else's private business; don't poke your nose in.

talkative noun
Characterized by talking too much or being unable to keep secrets; gossipy.

He has always been a big mouth; he can't keep any secrets.

Frequency

Movie subtitles
2.95 per million appears in 1% of films
Written text
0.811 per million

Sources

Definitions
CC-CEDICT