资料来源 : Webster's Revised Unabridged Dictionary (1913)

   {Snag boat}, a steamboat fitted with apparatus for removing
      snags and other obstructions in navigable streams. [U.S.]
      

   {Snag tooth}. Same as {Snag}, 2.

            How thy snag teeth stand orderly, Like stakes which
            strut by the water side.              --J. Cotgrave.