Wiktionary
unloop
vb. To remove a loop from, to unfasten from a loop.
Usage examples of "unloop".
The fishing reel his father had described had not been invented in this frame, though Kelvin, unlooping the line from the base knobs as rapidly as he could, felt that it was time.
He unlooped the laces that attached his deck shoes to his right wrist.
Kana unlooped his hand torch, set it on low, and pointed the ray into the nearest of those gashes.
He unlooped the long leash at his belt, with its slip ring and snap lock.
Bettik unloops eight meters of climbing line and we attach this to our harnesses with locking carabiners.