knockback

noun3

1. •
   A blow that causes the recipient to fall or move backwards, a knock back; a recoil.

   • He lifted his hand in a knockback spell, which would send me sailing right into the zombie. — 2006
2. •
   (UK, informal) A rejection; a refusal.

   • He got a few knockbacks today when he tried to give his resume out at the local shops.
3. •
   Something that impedes or reverses progress; a setback.

   • […]the chemo had not worked and had gone back into his brain.[…]He had knockback after knockback. It would have taken its toll on anyone. — 2011