Noun
over-under (plural over-unders)
The spread or other predicted value for wagers.
Scoring was so scarce that bookmakers could not set the over-under total low enough. Source: Internet
To be attractive to exhibitors, these schemes offered 3D films that can be projected by a standard 35 mm cinema projector with minimal modification, and so they are based on the use of "over-under" film prints. Source: Internet