lick (someone's) boots
To flatter, fawn over, or eagerly agree with someone, especially a person of higher authority as a means of currying favor. It's no wonder you're the teacher's favorite from the way you lick her boots! Look, it's just the nature of this business that sometimes you have to lick your superiors' boots if you want to get ahead.
lick (someone's) boots
To behave in a servile or obsequious manner toward someone.