打預防針

Simplified: 打预防针

dǎyùfángzhēn ㄉㄚˇ ㄩˋ ㄈㄤˊ ㄓㄣ

    • to take precautions in advance
    • to forewarn

Character by character

Saying俗语俗語

Idiom惯用语 · In everyday use

Literally
give a preventive injection
Meaning
To take precautions in advance, such as by warning people of trouble ahead. Close to 'to forewarn' or 'to inoculate against'.

Sources