unlace

verb

Etymology: From Middle English unlacen, unlasen, equivalent to un- + lace.

1. To remove the knot from laces; to undo laces.

   “Unlace your shoes before taking them off.”

   “Bradly tapped the ashes from his pipe, signifying a leisured interlude over. "Time to get a move on," he said, and began to unlace his boots for wading.”

2. To loosen the clothing of (a person).
3. To remove (film) from a projector.