Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Gnomish

gratha-

verb. to rub, scratch, fray

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.