Source : Webster's Revised Unabridged Dictionary (1913)

Scrag \Scrag\ (skr[a^]g), n. [Cf. dial. Sw. skraka a great dry
   tree, a long, lean man, Gael. sgreagach dry, shriveled,
   rocky. See {Shrink}, and cf. {Scrog}, {Shrag}, n.]
   1. Something thin, lean, or rough; a bony piece; especially,
      a bony neckpiece of meat; hence, humorously or in
      contempt, the neck.

            Lady MacScrew, who . . . serves up a scrag of mutton
            on silver.                            --Thackeray.

   2. A rawboned person. [Low] --Halliwell.

   3. A ragged, stunted tree or branch.

   {Scrag whale} (Zo["o]l.), a North Atlantic whalebone whale
      ({Agaphelus gibbosus}). By some it is considered the young
      of the right whale.

Scrag \Scrag\, v. t. [Cf. {Scrag}.]
   To seize, pull, or twist the neck of; specif., to hang by the
   neck; to kill by hanging. [Colloq.]

         An enthusiastic mob will scrag me to a certainty the
         day war breaks out.                      --Pall Mall
                                                  Mag.

Source : WordNet®

scrag
     n 1: lean end of the neck
     2: the lean end of a neck of veal [syn: {scrag end}]
     v 1: strangle with an iron collar; "people were garrotted during
          the Inquisition in Spain" [syn: {garrote}, {garrotte}, {garotte}]
     2: wring the neck of; "The man choked his opponent" [syn: {choke}]
     [also: {scragging}, {scragged}]