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From The Collaborative International Dictionary of English v.0.48:
Unstock \Un*stock"\, v. t. [1st pref. un- + stock.] [1913 Webster] 1. To deprive of a stock; to remove the stock from; to loose from that which fixes, or holds fast. [1913 Webster] 2. To remove from the stocks, as a ship. [1913 Webster]