摸老虎屁股

mōlǎohǔpìgu ㄇㄛ ㄌㄠˇ ㄏㄨˇ ㄆㄧˋ ˙ㄍㄨ

    • to dare to challenge powerful people
    • to take on a very thorny problem

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
touch the tiger's backside
Meaning
Dare to challenge powerful people or take on a very thorny problem. Can be approving of boldness or warn of danger.

Sources