pour oil on troubled waters

/pˈɔː ˈɔɪl ˌɒn tɹˈʌbəld wˈɔːtəz/

/pˈoːɹ ˈɔɪl ˌɑːn tɹˈʌbəld wˈɔːɾɚz/

to pour oil on troubled waters

to say things in order to settle a dispute or disagreement

Examples

1. His ideas caused real dissension within the party at first, but he poured oil on troubled waters in last night's speech.