Webster's English Dictionary

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cop

1. cop \'ka:p\ n [ME, fr. OE copp] dial chiefly Eng  1: TOP, CREST  2: a 
   cylindrical or conical mass of thread, yarn, or roving wound on a quil l or 
   tube; also : a tube or quill upon which it is wound
2. cop vt or copped;  or cop.ping [perh. fr. D kapen to steal, fr. Fris 
   ka-pia to take away; akin]to OHG kouf trade - more at CHEAP slang  1: 
   CATCH, CAPTURE  slang  2: STEAL, SWIPE 
3. cop n [short for 3copper] : POLICEMAN