Definition of "nerf"

nerf¹

/nɜːf/

verb
third-person singular simple present nerfs, present participle nerfing, simple past and past participle nerfed
1. (motor racing, transitive) To bump lightly, whether accidentally or purposefully.

/nɜːf/

verb
third-person singular simple present nerfs, present participle nerfing, simple past and past participle nerfed
1. (transitive, slang, video games) To change a mechanic, an ability or a character in a video game in order to make a previously dominant strategy less viable or less effective.
2. (transitive, slang) To arbitrarily limit or reduce the capability of.
  Quotations
  Tesla nerfs Autopilot in Europe due to new regulations
  2019 May 17, Fred Lambert, Electrek‎, retrieved 2019-05-19
noun
plural nerfs
1. (slang, video games) The deterioration, weakening or worsening of a character, a weapon, a spell, etc.