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From The Collaborative International Dictionary of English v.0.48:
Unclasp \Un*clasp"\ ([u^]n*kl[.a]sp"), v. t. [1st pref. un- + clasp.] To loose the clasp of; to open, as something that is fastened with, or as with, a clasp; as, to unclasp a book; to unclasp the hands; to unclasp one's heart. [1913 Webster]