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

1.
glätten, beschwichtigen, schönreden
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.
Er versuchte, den Streit zwischen seinen Freunden zu glätten.
•
The manager tried to smooth over the customer's complaints with a discount.
Der Manager versuchte, die Beschwerden des Kunden mit einem Rabatt zu beschwichtigen.