刮阴风

Traditional (Taiwan): 刮陰風

guāyīnfēng ㄍㄨㄚ ㄧㄣ ㄈㄥ

    • to spread rumours or hostile propaganda in secret

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
blow a dark wind
Meaning
To secretly spread rumours or hostile propaganda. Critical.

Sources