Longman Dictionary of Contemporary English
fightback
noun
EXAMPLES FROM CORPUS
▪ But she's being encouraged in her fightback by a young rider who's recovering from a similar fall.
▪ But that was before Sporting's exhilarating fightback.
▪ Soon after the virus arrives, the number of protective cells falls, only to rise as the body's fightback begins.
Wiktionary
fightback
n. a campaign of resistance; a counterattack