unwrast

“When Sir Tristram saw him make such countenance he looked upon both his hands that were fast bounden unto two knights, and suddenly he pulled them both to him, and unwrast his hands, and then he leapt unto his cousin, Sir Andred, and wrested his sword out of his hands; then he smote Sir Andred that he fell to the earth, and so Sir Tristram fought till that he had killed ten knights.”

Le Morte Darthur: Sir Thomas Malory's Book of King Arthur and of his Noble Knights of the Round Table, Volume 1