交白卷

jiāobáijuàn ㄐㄧㄠ ㄅㄞˊ ㄐㄩㄢˋ

    • to fail completely to accomplish a task
    • to produce no result

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
hand in a blank exam paper
Meaning
To fail completely to accomplish a task or produce any result. Critical or self-deprecating.

Sources