扇車嘴

Simplified: 扇车嘴

shànchēzuǐ ㄕㄢˋ ㄔㄜ ㄗㄨㄟˇ

    • a loose-lipped person who cannot keep a secret
    • blabbermouth

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
winnowing-machine mouth
Meaning
A person who talks carelessly and cannot keep a secret. Mildly critical, informal.

Sources