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From The Collaborative International Dictionary of English v.0.48:
Cop \Cop\ (k[o^]p), n. [AS. cop; cf. G. kopf head. Cf. Cup, Cob.] 1. The top of a thing; the head; a crest. [Obs.] [1913 Webster] Cop they used to call The tops of many hills. --Drayton. [1913 Webster] 2. A conical or conical-ended mass of coiled thread, yarn, or roving, wound upon a spindle, etc. [1913 Webster] 3. A tube or quill upon which silk is wound. [1913 Webster] 4. (Mil. Arch.) Same as Merlon. [1913 Webster] 5. A policeman. [Slang] [1913 Webster] Cop waste, a kind of cotton waste, composed chiefly of remnants of cops from which the greater part of the yarn has been unwound. [1913 Webster] copacetic