"So long!"
'so long' is the definition.
(synonyms)
This is all the clue.
(Other definitions for bye that I've seen before include "Farewell! (informal)" , "Extra run; farewell" , "I'm off" , "[ADIEU]" , "Law of the local authority" .)
'so long' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for toodle-oo that I've seen before include "Bye!" , "Cheerio" , "Goodbye (dated)" , "See you later!" , "Ta-ta" .)
'so long' is the definition.
(I've seen this in other clues)
This is all the clue.
(Other definitions for tata that I've seen before include "See you" , "cheerio!" , "So long!" .)