cheerio
Word family nouncheerercheerfulnesscheerinesscheerishnesscheerlessnesscheerleadercheeradjectivecheerfulcheeringcheerlesscheerlycheeryadverbcheerfullycheerilycheerlesslyinterjectioncheerio
cheer·i·o /ˌtʃɪəriˈəʊ $ ˌtʃɪriˈoʊ/ interjection British EnglishBrE informal GOODBYEgoodbye 再见,回头见
Origin cheerio (1900-2000) cheer