1a return by a well-known person, especially an entertainer or sports player, to the activity in which they have formerly been successful:the heavyweight champion is set to make his comeback in England [as modifier]:a comeback tour
a return to fashion of an item, activity, or style:trouser suits are making acomeback
2 informal a quick reply to a critical remark:some of my best comebacks just go right over people’s heads
[mass noun] the opportunity to seek redress:there’s no comeback if he messes up your case
3Australian/NZ a sheep bred from cross-bred and pure-bred parents for both wool and meat.
comeback in other Oxford dictionaries
Definition of comeback in the US English dictionary