From de- +‎ rig.

derig (third-person singular simple present derigs, present participle derigging, simple past and past participle derigged)

1. (nautical, transitive, intransitive) To remove the rigging from (a vessel, etc.).
   • 2002, Eric Stiller, Keep Australia On Your Left: A True Story of an Attempt to Circumnavigate Australia by Kayak, page 106:

     "No way, we have to derig." "Okay. I'll keep paddling." I started untangling lines, pulling in jibsail cloth like a lobster fisherman pulling up a trap.

• unrig

• Ridge, dirge, gride, redig, ridge