on the flat

on the flat

1. On a level plane, i.e., without slopes or hills. I'd actually recommend building the house into the side of the hill—if you build it on the flat at the bottom, you run the risk of flooding during heavy rainfall. They've designed the marathon so that the majority of it is run on the flat.
2. In horseracing, taking place in an open course without jumps. The jockey is much better on the flat than he is in races with jumps.
See also: flat, on

on the flat

1 on level ground as opposed to uphill. 2 (of a horse race) on an open course as opposed to one with jumps.
See also: flat, on
References in classic literature ?
That sharp stake at the landing had torn off the strip of batting nailed on the flat. Anne did not know this, but it did not take her long to realize that she was in a dangerous plight.
Seekamist Gordon Elliott 8th, 2m four-year-old maiden hurdle, Navan, March 2 This filly by Famous Name did little in three outings on the Flat for Dermot Weld, and was well beaten on her first two starts over hurdles for Gordon Elliott, but there was a bit more to like about this third hurdles start.