ungrapple

verb2

1. •
   To release from a grappling hook.

   • But, the waves of the sea growing high, we were forced to ungrapple, and to leave our men fighting on board her from eight of the clock in the evening till eight in the morning. — 1897
2. •
   To disengage; to release from being held.

   • The lifting beam assembly is automatic and is manually set by the operator to automatically grapple or ungrapple with the stoplog assembly — 2008