Meaning of Nerf in English:

Nerf

(also nerf)

Pronunciation /nəːf/

noun

Trademark
  • A type of foam rubber used to make toys and sports equipment.

    ‘Would nothing be dangerous if everything was made out of Nerf?’
    • ‘a Nerf football’

verb

[with object]
  • 1US informal Cause to be weak or ineffective.

    • ‘the constant zone running nerfed Michigan's pass rush’
    • ‘the government is nerfing our upload speeds’
    1. 1.1(of a video game developer) reduce the power of (a character, weapon, etc.) in a new instalment or update of a video game.
      • ‘ever since they nerfed the shield, the game just isn't as fun’
      • ‘the most used rifle has been subjected to nerfing’

Origin

1970s apparently an arbitrary formation.