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Use "unfastening" in a sentence
"The unfastening was a matter of very few moments, and then with the painter in hand he worked right beneath the cabin-window, when Mr Gregory slid down and joined him."
"“Mmm,” the king responded mildly, fastening and unfastening the catches on the curtained windows."
"After gently unfastening the elastic strap keeping his dearest musings safe from prying eyes, little literary artiste Evan Stansky penned a few more darling thoughts into his clothbound Moleskine notebook Wednesday."