A verb appearing as G. gratha- “rub, scratch, fray” in the Gnomish Lexicon of the 1910s (GL/42), probably based on the early root ᴱ√GWAṘA “rub” (QL/103).

Neo-Sindarin: Since it conflicts with no later verbs, I retain ᴺS. gratha- “to rub, scratch, fray” for purposes of Neo-Sindarin. I assume it is a late invention unrelated to √RATH “climb”, comparable to Q. psar- “rub” which was another late innovation in the Quenya language branch.