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cheerio

exclamation
 
/ˌtʃɪə.riˈəʊ/ US  /ˌtʃɪr.iˈoʊ/ UK old-fashioned

Definition

goodbye: Cheerio! Have a good trip!Welcoming, greeting and greetings
(Definition of cheerio exclamation from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of cheerio