lick boots

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.
See also: boot, lick
Farlex Dictionary of Idioms.

lick (someone's) boots

To behave in a servile or obsequious manner toward someone.
See also: boot, lick
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • lick (someone's) boots
  • lick somebody's boots
  • lick someone's boots