"Sayonara!"
'sayonara' is the definition.
(synonyms)
This is all the clue.
(Other definitions for bye that I've seen before include "Cheerio" , "See you" , "Reason not to play" , "Farewell! (informal)" , "Run scored in cricket from a ball that passes batman" .)
'sayonara' is the definition.
(I know that sayonara can be written as adios)
This is all the clue.
(Other definitions for adios that I've seen before include "Goodbye, amigo" , "Good-bye (Sp.)" , "Farewell amigo!" , "Goodbye (20 across)" , "Goodbye (Spanish)" .)