come back swinging
When someone pushes you down, but you push back and, against all odds, thrive and show them that you're still strong and maybe even better than before. Also, from a Kelly Clarkson song :D
"You didn't think that I'd come back, I come back swingin" -Stronger by Kelly Clarkson ~ "I'm not gonna let them get the better of me, I'm gonna come back swinging and show them they can't break me."