unbacking

Verb

unback (third-person singular simple present unbacks, present participle unbacking, simple past and past participle unbacked)

1. (rare, transitive) To remove the back or backing from (something).
   • “When you go home,” resumed Josephine, “unback the miniature case and upon the surface opposite the painting you will find these words […]”1896, Ida Worden Wheeler, chapter 10, in Siegfried the Mystic, Boston: Arena Publishing Company, page 109
2. (obsolete, transitive) To deprive (a horse) of its rider.
   • Her horse againe this Princesse must vnbacke,1599, Henry Petowe, Philochasander and Elanira, London: Thomas Purfoot