Webster's Revised Unabridged Dictionary · 1913

Swink

Swink , intransitive verb

[Anglo-Saxon swincan, akin to swingan. See Swing.]

To labor; to toil; to salve. [Obsolete 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 , transitive verb

1.
To cause to toil or drudge; to tire or exhaust with labor. [Obsolete]
And the swinked hedger at his supper sat. — Milton
2.
To acquire by labor. [Obsolete] — Piers Plowman
To devour all that others swink. — Chaucer

Swink , noun

[As. swinc, geswinc.]

Labor; toil; drudgery. [Obsolete] — Chaucer. Spenser