空口說白話

Simplified: 空口说白话

kōngkǒushuōbáihuà ㄎㄨㄥ ㄎㄡˇ ㄕㄨㄛ ㄅㄞˊ ㄏㄨㄚˋ

    • to make empty promises

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
speak plain words with an empty mouth
Meaning
To say things with no proof to back them up, or to talk without acting. Critical.

Sources