Question

to thumb your nose at someone or something - He always thumbed his nose at his teachers. Nothing they could say or do had any effect on him.  - In some countries it is dangerous to thumb your nose at the religious or political authorities.

Accepted Answer

to show disrespect or disdain for someone or something

Idiom	to thumb your nose at someone or something
Definition	to show disrespect or disdain for someone or something
Examples	- He always thumbed his nose at his teachers. Nothing they could say or do had any effect on him. - In some countries it is dangerous to thumb your nose at the religious or political authorities.

Nose Thumb Show Disrespect Disdain Thumbed Teachers Effect