colla passive participle "borne, worn" (compare #col- "bear"); also used as a noun = "vestment, cloak" (MR:385). Variant form collo "cloak" _(SA:thin(d) ) _in the name Sindicollo (q.v.), sc. colla with a masculine ending.
Quenya
collo
noun. cloak
colla
borne, worn
arwa
in control of, possessing
arwa (1) adj. "in control of, possessing" (followed by genitive, e.g. *arwa collo, "having a cloak [colla]"). Also suffix -arwa"having", as in aldarwa "having trees, tree-grown" (3AR). In a deleted entry in the Etymologies, -arwa was glossed "having, possessing, holding, controlling" (VT45:14)
A word for “cloak” appearing in Sindacollo “Grey Cloak” cognate to S. Thingol (PE17/72; SA/thin(d)), clearly a derivative of √KOL “bear, carry, wear”.