开空头支票

Traditional (Taiwan): 開空頭支票

kāikōngtóuzhīpiào ㄎㄞ ㄎㄨㄥ ㄊㄡˊ ㄓ ㄆㄧㄠˋ

    • to make empty promises
    • to promise what one cannot or will not deliver

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
write a blank (uncashable) cheque
Meaning
To make a promise you do not intend or cannot manage to keep. Critical. Close to "make empty promises".

Sources