1) To overstride a horse 2) To stand or sit astride of 3) To tower over 
• (v. t.) To stride over or beyond.
O`ver·stride' transitive verb To stride over or beyond. 
to surpass: to overstride one's competitors. · to stand or sit astride of; bestride: a great statue overstriding the entrance; to overstride a horse. · to tower over; dominate: He overstrides the committee with loud aggressiveness. · to stride or step over or across: At its narrowest point, one can easily overstride the stream. ...