过独木桥

Traditional (Taiwan): 過獨木橋

guòdúmùqiáo ㄍㄨㄛˋ ㄉㄨˊ ㄇㄨˋ ㄑㄧㄠˊ

    • to take a very risky route
    • to pass through a narrow bottleneck, as in a fiercely competitive exam

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
cross a single-log bridge
Meaning
To pass through a very risky route, or a narrow bottleneck where few can get through, such as a fiercely competitive exam.

Sources