v. to flatter someone; to treat someone especially nice so that you can ask him for something or some favors.
The financial manager is working hard to butter up the boss to get a promotion.
She didn’t waste time before buttering up our boss.
How does your boss like it?
Guess what? She gets a raise within 1 month. Our boss is never nice to me.
If you can also butter up your boss, maybe he won’t give you a hard time.