reconcile; bring together; compromise; make peace between(someone • Even my father couldn't make peace between them. • Peace did not last long, and in the forthcoming war, she still tried to make peace between her sons.
); keep the peace between(You'll find a way to keep the peace between Catherine and Kristen.)
make good(разг. Баян); make it up(chiefly British usage: to become friendly again after being angry (Merriam-Webster) • "Telling a fellow he was getting a double chin!" "Did she do that?" "She did." "Oh, well, girls will be girls. Forget it, Tuppy. Go to her and make it up." He shook his head. (P.G. Wodehouse) – Ступай к ней и помирисьART Vancouver)
kiss and make up(иногда это выражение используют в прямом значении, иногда в переносном смысле • After the meeting Mr. X and Mr. Y kissed and made up. – После встречи мистер X и мистер Y помирились. • Let's kiss and make up. — Давай поцелуемся и забудем всё это.)
reverso.net)