To calm, soothe, or mellow someone's feelings or the atmosphere (transitive). Used when something or someone causes a calming effect.
彼女の冗談が会場の緊張を和めた。
Her joke eased the tension in the room.
父はいつもみんなの気持ちを和める話し方をする。
My father always speaks in a way that soothes everyone's feelings.
温かい紅茶が疲れた心を和めてくれた。
A cup of warm tea soothed my tired heart.