根子粗

gēnzicū ㄍㄣ ˙ㄗ ㄘㄨ

    • to have powerful backers
    • to be hard to deal with

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
the root is thick
Meaning
Says that someone has powerful backers and is hard to deal with.

Sources