the world > space > shape > curvature > coil > uncoiling or unwinding > [noun]
unwinding1648
backing-off1839
uncoiling1839
1839 A. UreDict. Arts 369 It is necessary to turn the rim beforehand a little in the opposite direction..an operation called in technical language, the backing off.
1851 L. D. B. Gordon in Art Jrnl. Illustr. Catal. vi. **/2 This operation of undoing the coil is called the backing-off.