lick sb's boots INFORMAL (OFFENSIVE lick sb's arse/ass)
to be extremely obedient to someone, usually in order to get an advantage:
He needn't expect me to go licking his boots!

[TahlilGaran] Advanced Learner's Dictionary ▲

lick boots
lick (someone's) boots
[informal]
to try too hard to please someone important.
I'm not prepared to lick someone's boots to get a promotion.

[TahlilGaran] English Idioms Dictionary ▲

lick one's boots
v. phr. To flatter or act like a slave; do anything to please another.
She wanted her boyfriend to lick her boots all the time.
A wise king would not want his friends and officials to lick his boots.

[TahlilGaran] English Idioms Dictionary ▲

lick someone's boots
lick (someone's) boots
[informal]
to try too hard to please someone important.
I'm not prepared to lick someone's boots to get a promotion.

[TahlilGaran] English Idioms Dictionary ▲