敲警鐘

Simplified: 敲警钟

qiāojǐngzhōng ㄑㄧㄠ ㄐㄧㄥˇ ㄓㄨㄥ

    • to sound the alarm
    • to warn of danger

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
ring the alarm bell
Meaning
To warn people of danger. Used of a warning or a wake-up call.

Sources