Question about a term I heard on the backside

[Foxtrot_s]

…especiallly the horse’s backside.

[NancyM]

“Backside” is the opposite of “Frontside”, which is the area that the betting public frequents. “Backside” encompasses the area of the facility where the public does not go. The backside is the part of the facility where the horsemen and horses are. The backstretch is technically the side opposite of the track from the finish line.