Unfastens (6)
I believe the answer is:
unties
(Other definitions for unties that I've seen before include "Undoes, loosens a knot" , "Opens knot to release" , "Loosens laces" , "Undoes, a knot perhaps" .)
I believe the answer is:
unties
(Other definitions for unties that I've seen before include "Undoes, loosens a knot" , "Opens knot to release" , "Loosens laces" , "Undoes, a knot perhaps" .)