GNU Collaborative International Dictionary of English

Found one definition

1.       
   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]
   
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   Or swink with his hands and labor. Chaucer.
   
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   For which men swink and sweat incessantly. Spenser.
   
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   The swinking crowd at every stroke pant “Ho.” Sir Samuel Freguson.
   
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