Gnomish
belin
adjective. expanded, unrolled, unfurled, set (of sails)
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!
An adjective appearing in the Gnomish Lexicon of the 1910s as G. {belum >>} belin “expanded, unrolled, unfurled, set (of sails)”, based on the verb G. belu- “unroll, unfurl” (GL/22).
Neo-Sindarin: Since I retain the Neo-Root ᴺ√BELU “unroll, ✱unfurl” to serve as the basis for “sail” words, I would retain and adapt this Gnomish adjective as ᴺS. belen “expanded, unrolled, unfurled, set (of sails)”.