soften up
US /ˈsɑːf.ən ʌp/
UK /ˈsɑːf.ən ʌp/

1.
ablandar, suavizar, conquistar
to make someone feel more friendly, less angry, or more willing to help
:
•
He tried to soften up the boss before asking for a raise.
Intentó ablandar al jefe antes de pedir un aumento.
•
A little flattery can often soften up even the toughest critics.
Un poco de halago a menudo puede ablandar incluso a los críticos más duros.