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
   1913 webster

         or swink with his hands and labor.       --chaucer.
   1913 webster

         for which men swink and sweat incessantly. --spenser.
   1913 webster

         the swinking crowd at every stroke pant "ho." --sir
                                                  samuel
                                                  freguson.
   1913 webster
see also:
swank swonk swonken swinking swing