unlace

un- +‎ lace.

unlace (third-person singular simple present unlaces, present participle unlacing, simple past and past participle unlaced)

1. (transitive) To remove the knot from laces; to undo laces.

   Unlace your shoes before taking them off.

   • 1938, Norman Lindsay, Age of Consent, 1st Australian edition, Sydney, N.S.W.: Ure Smith, published 1962, →OCLC, page 139:

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

• lace up

• Lucena, auncel, auncle, cuneal, lacune, launce