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
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   2. To open, in general; to lay open; to undo.
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            Unlock your springs, and open all your shades.
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            [Lord] unlock the spell of sin.       --J. H.
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