Source : Webster's Revised Unabridged Dictionary (1913)

Swink \Swink\, v. i. [imp. {Swank}, {Swonk}; p. p. {Swonken}; p.
   pr. & vb. n. {Swinking}.] [AS. swincan, akin to swingan. See
   {Swing}.]
   To labor; to toil; to salve. [Obs. or Archaic]

         Or swink with his hands and labor.       --Chaucer.

         For which men swink and sweat incessantly. --Spenser.

         The swinking crowd at every stroke pant ``Ho.'' --Sir
                                                  Samuel
                                                  Freguson.

Swink \Swink\, v. t.
   1. To cause to toil or drudge; to tire or exhaust with labor.
      [Obs.]

            And the swinked hedger at his supper sat. --Milton.

   2. To acquire by labor. [Obs.] --Piers Plowman.

            To devour all that others swink.      --Chaucer.

Swink \Swink\, n. [As. swinc, geswinc.]
   Labor; toil; drudgery. [Obs.] --Chaucer. Spenser.