没长前后眼

Traditional (Taiwan): 沒長前後眼

méizhǎngqiánhòuyǎn ㄇㄟˊ ㄓㄤˇ ㄑㄧㄢˊ ㄏㄡˋ ㄧㄢˇ

    • to be unable to foresee an unexpected event or how things turn out

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
didn't grow eyes in front and behind
Meaning
Said when you could not foresee an unexpected event or how things would turn out.

Sources