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

1.
hacer la pelota, lamer el culo
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.
Siempre está haciéndole la pelota al jefe para conseguir un ascenso.
•
I hate how she always sucks up to the teachers.
Odio cómo siempre le hace la pelota a los profesores.