nerf UK /nɜːf/US /nɝf/verb 3noun 1forms 3 verb3 •(slang) To change a mechanic, an ability, or a character in a video game in order to make less efficacious.The lightning spell was originally pretty powerful, but in the sequel they nerfed it so it became completely useless. •(slang) To arbitrarily limit or reduce the capability of.Tesla nerfs Autopilot in Europe due to new regulations — 2019 •To bump lightly, whether accidentally or purposefully.A racer will often nerf another as a psychological tactic. noun1 •(slang) The deterioration, weakening or worsening of a character, a weapon, a spell, etc. formsnerfed · nerfing · nerfs