隔夜賬

Simplified: 隔夜账

géyèzhàng ㄍㄜˊ ㄧㄝˋ ㄓㄤˋ

    • old unsettled grudge or debt of favour

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
a bill left unsettled overnight
Meaning
Refers to an old grudge or debt of favour that was never settled. It is used when someone drags up past quarrels.

Sources