to resist strongly or attack sb who has attacked you :
Don't let them bully you. Fight back!
It is time to fight back against street crime.
to resist strongly or attack sb who has attacked you :
Don't let them bully you. Fight back!
It is time to fight back against street crime.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005