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From The Collaborative International Dictionary of English v.0.48:
Unlock \Un*lock"\, v. t. [Cf. AS. unl?can. See 1st Un-, and Lock, v. t.] 1. To unfasten, as what is locked; as, to unlock a door or a chest. [1913 Webster] 2. To open, in general; to lay open; to undo. [1913 Webster] Unlock your springs, and open all your shades. --Pope. [1913 Webster] [Lord] unlock the spell of sin. --J. H. Newman. [1913 Webster]