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From The Collaborative International Dictionary of English v.0.48:
Uncock \Un*cock"\, v. t. [1st pref. un- + cock.] 1. To let down the cock of, as a firearm. [1913 Webster] 2. To deprive of its cocked shape, as a hat, etc. [1913 Webster] 3. To open or spread from a cock or heap, as hay. [1913 Webster]