suck up to
US /sʌk ʌp tə/
UK /sʌk ʌp tə/

1.
leccare i piedi, fare il ruffiano
to try to make someone in authority like you by flattering them or being overly helpful, often in a way that is not sincere
:
•
He's always sucking up to the boss to get a promotion.
Sta sempre leccando i piedi al capo per ottenere una promozione.
•
I hate how she always sucks up to the teachers.
Odio come si lecca i piedi agli insegnanti.