Definition of "unlace"

unlace

verb
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.
  Quotations
  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.
  1938, Norman Lindsay, Age of Consent, 1st Australian edition, Sydney, N.S.W.: Ure Smith, published 1962, page 139
2. (transitive) To loosen the clothing of (a person).
3. (transitive) To remove (film) from a projector.