白費唾沫星子

Simplified: 白费唾沫星子

báifèituòmoxīngzi ㄅㄞˊ ㄈㄟˋ ㄊㄨㄛˋ ˙ㄇㄛ ㄒㄧㄥ ˙ㄗ

    • to talk in vain
    • to waste one's breath

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
waste specks of spit
Meaning
To talk in vain; to waste one's breath. Colloquial.

Sources