Definition of cheerio exclamation from the Oxford Advanced Learner's Dictionary

 

cheerio

 exclamation
exclamation
BrE BrE//ˌtʃɪəriˈəʊ//
 
; NAmE NAmE//ˌtʃɪriˈoʊ//
 
(British English, informal)
 
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goodbye Cheerio! I'll see you later. Cheerio now. Cheerio then. See you on Wednesday.