What does "colly" mean?

Colly: The black grime or soot of coal. [Obs.] Burton.

Additional senses

  1. 2.To render black or dark, as of with coal smut; to begrime. [Archaic.] Thou hast not collied thy face enough. B. Jonson. Brief as the lighting in the collied night. Shak.
  2. 3.A kind of dog. See Collie.

Sources