A verb in the Gnomish Lexicon of the 1910s with various glosses: “depart, go, leave”, “c. gen. leave the place of, time of, speaker”, and “go forward” (GL/58). Below it Tolkien wrote another word G. mu whose gloss may be “flow” or “from” according to the editors. This mu may be the basis of the verb mútha-, especially if mu means “from”.
Gnomish
gomintha
adverb. together
cinga-
verb. to go wrong, get tangled
failtha-
verb. go pale
mútha-
verb. to depart, go, leave; (c. gen.) to leave the place of or time of speaker; to go forward
suthra-
verb. to hush, to make or go quiet
a
preposition. from
cangi-
verb. to go wrong, get tangled
o
preposition. from
An adverb in the Gnomish Lexicon of the 1910s, a combination of G. go- “together” and G. mintha “in one place” (GL/41).