Learner's definition of COMEBACK
1 a : a return to a former good position or condition b : a return to being popular or fashionable c : a new effort to win or succeed after being close to defeat or failure
The team was trailing after the first half, but they made/staged a comeback and won in the second half.
The team mounted a comeback in the second half of the season.
2 : a quick reply or response
— see also come back at 1come