The Collaborative International Dictionary of English v.0.48:

Slate \Slate\, v. t. [Cf. AS. sl[=ae]ting a privilege of
   hunting.]
   To set a dog upon; to bait; to slat. See 2d Slat, 3. [Prov.
   Eng. & Scot.] [Written also slete.] --Ray.
   [1913 Webster]