Definition of "nerf"
nerf1
/nɜːf/
verb
third-person singular simple present nerfs, present participle nerfing, simple past and past participle nerfed
(motor racing, transitive) To bump lightly, whether accidentally or purposefully.
nerf2
/nɜːf/
verb
third-person singular simple present nerfs, present participle nerfing, simple past and past participle nerfed
(transitive, slang) To arbitrarily limit or reduce the capability of.