当跳板

Traditional (Taiwan): 當跳板

dàngtiàobǎn ㄉㄤˋ ㄊㄧㄠˋ ㄅㄢˇ

    • to use a person or thing as a stepping stone to one's own aim

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
use as a springboard
Meaning
To use a person or thing as a stepping stone toward one's own aim. Often critical.

Sources