pour oil on troubled waters

US /pɔr ɔɪl ɑn ˈtrʌb.əld ˈwɑ.tərz/
UK /pɔr ɔɪl ɑn ˈtrʌb.əld ˈwɑ.tərz/
"pour oil on troubled waters" picture
1.

to try to make people feel calmer and more friendly toward each other when there is a disagreement

:
She always tries to pour oil on troubled waters during family arguments.
The manager stepped in to pour oil on troubled waters after the heated debate.