Lick Someone's Boots Meaning

The phrase lick someone's boots means to act in a servile or obsequious way toward someone, especially to gain favor from them.

Shakespeare used this idiom in the form of lick someone's shoe in The Tempest (3:2) when Caliban wants to serve Stephano rather than Trinculo, offering to lick his shoe

How does thy honour? Let me lick thy shoe.
I'll not serve him; he's not valiant.

Example: She seizes every opportunity to lick the boss's boots.