Middling
Betting both sides of a line that moved, so both can win.
If a total moves from 45.5 to 48.5 you can take the over at the low number and the under at the high one; any result in between wins both bets, while anything outside cancels to a small loss. Unlike Arbitrage (surebet) the profit is not guaranteed — it is a cheap shot at a large payoff. Compare with Hedging.