butter up
US /ˈbʌt.ər ʌp/
UK /ˈbʌt.ər ʌp/
1.
to flatter someone in order to gain a favor or special treatment
:
•
He tried to butter up his boss before asking for a raise.
•
You'll have to butter up the teacher if you want a good grade.
to flatter someone in order to gain a favor or special treatment