- (transitive) To detach from any connecting link or agency; to disconnect.
- (intransitive) To come untied or unloosed.
c. 1596–1599, William Shakespeare, The Second Part of Henrie the Fourth, Continuing to His Death, and Coronation of Henrie the Fift. With the Humours of Sir Iohn Falstaffe, and Swaggering Pistoll. As It hath been Sundrie Times Publikely Acted by the Right Honourable, the Lord Chamberlaine His Seruants, quarto edition, London: Printed by V[alentine] S[immes] for Andrew Wise, and William Aspley, published 1600, OCLC 55178895:, iv. 1. 209.
- He doth unfasten so and shake a friend.
to come untied or unloosed
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- unfasten in The Century Dictionary, The Century Co., New York, 1911