踩一腳

Simplified: 踩一脚

cǎiyījiǎo ㄘㄞˇ ㄧ ㄐㄧㄠˇ

    • to hit the brake
    • to stop the car

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
step on it once
Meaning
Driver's slang for hitting the brake and stopping the car.

Sources