unmortise

un·mor·tise

 (ŭn-môr′tĭs)
tr.v. un·mor·tised, un·mor·tis·ing, un·mor·tis·es
1. To loosen a mortised joint of.
2. To separate.

unmortise

(ʌnˈmɔːtɪs)
vb (tr)
to separate (a mortise and tenon)