The Collaborative International Dictionary of English v.0.48:

Slink \Slink\, v. t. [imp. Slunk, Archaic Slank; p. p.
   Slunk; p. pr. & vb. n. Slinking.] [AS. slincan; probably
   akin to G. schleichen, E. sleek. See Sleek, a.]
   1. To creep away meanly; to steal away; to sneak. "To slink
      away and hide." --Tale of Beryn.
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            Back to the thicket slunk
            The guilty serpent.                   --Milton.
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            There were some few who slank obliquely from them as
            they passed.                          --Landor.
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   2. To miscarry; -- said of female beasts.
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The Collaborative International Dictionary of English v.0.48:

Slink \Slink\, v. t.
   To cast prematurely; -- said of female beasts; as, a cow that
   slinks her calf.
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The Collaborative International Dictionary of English v.0.48:

Slink \Slink\, a.
   1. Produced prematurely; as, a slink calf.
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   2. Thin; lean. [Scot.]
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The Collaborative International Dictionary of English v.0.48:

Slink \Slink\, n.
   1. The young of a beast brought forth prematurely, esp. a
      calf brought forth before its time.
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   2. A thievish fellow; a sneak. [Prov. Eng. & Scot.]
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WordNet (r) 3.0 (2006):

slink
    v 1: walk stealthily; "I saw a cougar slinking toward its prey"