unknot

[ uhn-not ]

/ ʌnˈnɒt /

to untie by or as if by undoing a knot: to unknot a tie.

Origin of unknot

First recorded in 1590–1600; un-² + knot¹

And the child turned up the hill with her luge, leaving her elders to unknot the situation.

The Card, A Story Of Adventure In The Five Towns |Arnold Bennett
Fullarton said and, running to the bed, began to unknot the cord that bound the admiral.

Held Fast For England |G. A. Henty
In shaking out a reef, unknot the points first, then cast off the tack, and lastly the reef-pennant.

Harper's Young People, May 17, 1881 |Various
"We could not unknot the knots," added Tom, who was bound to have his joke.

The Rover Boys on Treasure Isle |Edward Stratemeyer (AKA Arthur M. Winfield)

Greg asked, his perspiring fingers slipping as he tried to unknot his tie.

Cancer World |Harry Warner