What idioms contain elm bumps?

Elm stump-a stubborn person

Idiom pronunciation:

Yumguda

Idiom explanation:

Hard elm roots. Metaphor is stubborn.

Idiom origin:

Ge Luo's captain of health: "everyone is the head of feudal superstition, and their hearts are like elm bumps, and they can't split three axes and five axes."

Common degree:

Common idioms

Emotional color:

Derogatory idioms

Idiom usage:

As objects and attributes; It is often used in figurative sentences.

Idiom structure:

Partial formal idioms