Source : Webster's Revised Unabridged Dictionary (1913)

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.]

            Cop they used to call The tops of many hills.
                                                  --Drayton.

   2. A conical or conical-ended mass of coiled thread, yarn, or
      roving, wound upon a spindle, etc.

   3. A tube or quill upon which silk is wound.

   4. (Mil. Arch.) Same as {Merlon}.

   5. A policeman. [Slang]

   {Cop waste}, a kind of cotton waste, composed chiefly of
      remnants of cops from which the greater part of the yarn
      has been unwound.

Source : WordNet®

cop
     n : uncomplimentary terms for a policeman [syn: {bull}, {copper},
          {fuzz}, {pig}]
     [also: {copping}, {copped}]

cop
     v 1: take by theft; "Someone snitched my wallet!" [syn: {hook}, {snitch},
           {thieve}, {knock off}, {glom}]
     2: take into custody; "the police nabbed the suspected
        criminals" [syn: {collar}, {nail}, {apprehend}, {arrest},
        {pick up}, {nab}]
     [also: {copping}, {copped}]