smooth over
US /smuːð ˈoʊvər/
UK /smuːð ˈoʊvər/

1.
suavizar, minimizar
to make a problem or difficulty seem less serious or important than it really is
:
•
He tried to smooth over the argument between his friends.
Intentó suavizar la discusión entre sus amigos.
•
The manager tried to smooth over the customer's complaints with a discount.
El gerente intentó suavizar las quejas del cliente con un descuento.