noun
favor; good graces
Used in set phrases like 歓心を買う (to curry favor) and 歓心を得る (to win someone's favor). Not used as a standalone noun in everyday speech.
彼は上司の歓心を買おうと必死だ。
He is desperate to curry favor with his boss.
贈り物で彼女の歓心を得ようとした。
He tried to win her favor with a gift.