verb (used with object)
verb (used without object)
Examples from the Web for unfasten
They also began to strip off their shirts and unfasten their vests.
She then began to unfasten her dress, and, taking down her untidy red hair, twisted it up into a knot at the back of her head.The Girls of St. Wode's|L. T. Meade
Tom, unfasten my overall at the back, please, and I will carry it over my arm.Anxious Audrey|Mabel Quiller-Couch
He knelt to unfasten his spurs and put them on the other's boots.The Biography of a Prairie Girl|Eleanor Gates