Definition of ta-ta exclamation from the Oxford Advanced Learner's Dictionary

 

ta-ta

 exclamation
exclamation
BrE BrE//ˌtæ ˈtɑː//
 
; NAmE NAmE//ˌtæ ˈtɑː//
 
(British English, informal)
 
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goodbye Ta-ta for now! see also TTFN Word Origin early 19th cent.: of unknown origin; compare with earlier da-da.