放橫炮

Simplified: 放横炮

fànghéngpào ㄈㄤˋ ㄏㄥˊ ㄆㄠˋ

    • to cause side problems that hinder progress

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
fire the cannon sideways
Meaning
To cause side problems that keep things from going smoothly.

Sources