A verb for “bite” in The Etymologies of the 1930s under the root ᴹ√NAK of the same meaning (Ety/NAK).
Conceptual Development: In the Gnomish Lexicon of the 1910s, G. nag- was glossed “chew, gnaw” and there was a separate verb G. nactha- for “bite” (GL/59). Both were clearly based on the early root ᴱ√NAKA “bite” (QL/64).
Neo-Sindarin: I’d limit the verb nag- to “bite” for purposes of Neo-Sinarin, and for “gnaw, chew” I’d use a neologism ᴺS. nadh- from the root ᴹ√NYAD “gnaw”.
@@@ In VT50/13 Carl Hostetter suggested this might be an indicative passive voice marker en, vs. subjunctive passive voice marker aen.