Wiktionary
buttered up
vb. (en-past of: butter up)
Usage examples of "buttered up".
I buttered up the old girl, invoked the memory of her dear father, indulged in some architectural double-talk, and got her okay.
There was that challenging sincerity on his face, daring Minogue to suspect that he was being buttered up.
So I buttered up one of the older fellows and got him to help me with my letters.