触龙鳞

Traditional (Taiwan): 觸龍鱗

chùlónglín ㄔㄨˋ ㄌㄨㄥˊ ㄌㄧㄣˊ

    • to anger the emperor or a powerful person

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
touch the dragon's scales
Meaning
To anger the emperor or a powerful person.

Sources