soothe

Synonyms: allay alleviate appease assuage balm becalm butter up calm down cheer compose console cool cool off dulcify help hush lighten lull make nice make up mitigate mollify pacify patch things up play up to pour oil on quiet quieten relieve settle smooth down soften square still stroke subdue take the edge off take the sting out tranquilize unburden untrouble

Antonyms: agitate distress upset worry