Release (a knot) (4)
I believe the answer is:
undo
(Other definitions for undo that I've seen before include "Take back" , "Release fastening" , "set free" , "(4)" , "Spoil" .)
I believe the answer is:
undo
(Other definitions for undo that I've seen before include "Take back" , "Release fastening" , "set free" , "(4)" , "Spoil" .)