OWLER

from The Collaborative International Dictionary of English v.0.48

Owler \Owl"er\, n. [From {Owl}, v. i.]
   One who owls; esp., one who conveys contraband goods. See
   {Owling}, n. [Obs. or Prov. Eng.] --T. Brown.
   [1913 Webster]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

OWLER, Eng. law. One guilty of the offence of owling.