There are several synonyms for the phrase "fawn over," which refers to lavish attention or praise on someone in an excessive or obsequious way. Some alternatives include idolize, worship, adore, flatter, butter up, coddle, cosset, baby, dote on, or smother with adoration. These terms are commonly used to describe behavior that is often seen as dishonest, insincere, or manipulative, with the aim of gaining favor or influence over the person being fawned over. While it's natural to want to demonstrate appreciation or admiration for someone we respect or admire, it's important to avoid overdoing it or coming across as phony.