Definitions for "Middles"
To win both sides of the same betting proposition; betting the favorite team at -1.5 with one bookmaker and then taking +3.5 with another bookmaker; the game ends up with the favorite winning by exactly 3 points, you have then "middled the game"; a favorite betting method of "Wise Guys".
Betting on both sides at different point spreads allowing you to win in either outcome
When you win both sides of the betting proposition.
Keywords:  brails, mains, below, lowers, above
The brails below the mains and above the lowers.
Furnish layer of a board situated between the two external furnish layers or between an underliner and the back furnish layer.