The Collaborative International Dictionary of English v.0.48:

Badger \Badg"er\, n. [Of uncertain origin; perh. fr. an old verb
   badge to lay up provisions to sell again.]
   An itinerant licensed dealer in commodities used for food; a
   hawker; a huckster; -- formerly applied especially to one who
   bought grain in one place and sold it in another. [Now
   dialectic, Eng.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Badger \Badg"er\, n. [OE. bageard, prob. fr. badge + -ard, in
   reference to the white mark on its forehead. See Badge,n.]
   1. A carnivorous quadruped of the genus Meles or of an
      allied genus. It is a burrowing animal, with short, thick
      legs, and long claws on the fore feet. One species (Meles
      meles or Meles vulgaris), called also brock, inhabits
      the north of Europe and Asia; another species (Taxidea
      taxus or Taxidea Americana or Taxidea Labradorica)
      inhabits the northern parts of North America. See
      Teledu.
      [1913 Webster]

   2. A brush made of badgers' hair, used by artists.
      [1913 Webster]

   Badger dog. (Zool.) See Dachshund.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Badger \Badg"er\, v. t. [imp. & p. p. Badgered; p. pr. & vb.
   n. Badgering.] [For sense 1, see 2d Badger; for 2, see
   1st Badger.]
   1. To tease or annoy, as a badger when baited; to worry or
      irritate persistently.
      [1913 Webster]

   2. To beat down; to cheapen; to barter; to bargain.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Badger
    n 1: a native or resident of Wisconsin [syn: Wisconsinite,
         Badger]
    2: sturdy carnivorous burrowing mammal with strong claws; widely
       distributed in the northern hemisphere
    v 1: annoy persistently; "The children teased the boy because of
         his stammer" [syn: tease, badger, pester, bug,
         beleaguer]
    2: persuade through constant efforts