Pronunciation (UK) IPA (key): /ˈswiːtˌhɑːt/ (US) IPA (key): /ˈswitˌhɑrt/ or [ˈswiˌɾ(ʱ)ɑrt̠̚] Audio (US)(file) Noun Singular sweetheart Plural sweethearts (countable) A sweetheart is someone you love in a romantic way. Synonyms: boyfriend, girlfriend, love, bae and darling My sweetheart gave me a box of candy on Valentine's Day. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads