Source : Webster's Revised Unabridged Dictionary (1913)

Overpass \O`ver*pass"\, v. t. [imp. & p. p. {Overpassed}; p. pr.
   & vb. n. {Overpassing}.] [Cf. {Surpass}.]
   1. To go over or beyond; to cross; as, to overpass a river;
      to overpass limits.

   2. To pass over; to omit; to overlook; to disregard.

            All the beauties of the East He slightly viewed and
            slightly overpassed.                  --Milton.

   3. To surpass; to excel. [R.] --R. Browning.

Overpass \O`ver*pass"\, v. i.
   To pass over, away, or off.

Source : WordNet®

overpass
     n : bridge formed by the upper level of a crossing of two
         highways at different levels; "an overpass is called a
         flyover or a flypast in England" [syn: {flyover}, {flypast}]
     [also: {overpast}]