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

botheb-

verb. to untie, undo, unloose

A verb appearing as G. botheb- “undo, untie, unloose” in the Gnomish Lexicon of the 1910s, a combination of G. bod- “back” (also = “un-”) and G. heb- “bind” (GL/23).

Neo-Sindarin: Neither the prefix or the sense of the verb survived in Tolkien’s later writings, so I would using the neologism ᴺS. dannod- “to untie, undo, unloose” instead, a reversed form of the later verb [N.] nod- “to tie”.