unsnib

Verb

 * 1) to undo, untie, or open or become undone, untied, or opened.
 * 2) * 1997, , 'Grace Notes' (novel), (Part 2, at page 262 in the 1998 Vintage paperback edition):
 * Catherine unsnibbed the [toilet] door and came out. She smiled bravely and went to wash her hands.
 * Somehow she managed to unsnib the window and escape.