Cut (one's) comb American British phrase
To humble someone who is acting arrogantly
She is too pompous when we work together. She’d better cut her comb.
Insisting that he’s never been in better shape despite bearing some minor scars from his training camp. Nurmagomedov told ESPN: “I’m going to cut his comb, teach him, sometimes slap him, make him tired. When he’s tired he always gives up. (journeyinlife.net)
My father told me: “Son, never rest on your laurels and cut your comb when you win someone.”
Acting and behaving like you are of great importance, but actually, you aren't
If something is beneath someone’s dignity, they feel that they are too important to do it.
To make one become realistic, especially for one often makes a boast
To humble an arrogant person.
The verb "cut" should be conjugated according to its tense.