nav·vy /ˈnævi/
  工人,挖土機
  Nav·vy n.; pl. Navies   Originally, a laborer on canals for internal navigation; hence, a laborer on other public works, as in building railroads, embankments, etc. [Eng.]
  ◄ ►
  navvy
       n : a laborer who is obliged to do menial work [syn: drudge, peon,
            galley slave]