Lewis & Short

ambŭlātor, ōris, m. [ambulo], one that walks about, i.e.,

  1. I. An idler, lounger: vilicus ne sit ambulator, Cato, R. R. 5, 2 (cf. id. ib. 5, 2: minus licebit ambulare); Col. 1, 8, 7.
  2. * II. A pedlar, hawker: Transtiberinus, Mart. 1, 42 (not found elsewhere).