smooth over

US /smuːð ˈoʊvər/
UK /smuːð ˈoʊvər/
"smooth over" picture
1.

to make a problem or difficulty seem less serious or important than it really is

:
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He tried to smooth over the argument between his friends.
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The manager tried to smooth over the customer's complaints with a discount.
:
alleviatemitigatemollifypalliatesoften
:
smoothsmooth snakesmooth downbe smooth sailingoverovereatingsmooth (somebody’s) ruffled feathers