Over/Under (O/U)
(blackjack)
Two side bets that can be made in blackjack. In the over bet,
the player is wagering that his two card total will be less
than 13. In the under bet, the player is wagering that his total
will be more than 13. In either case, if the total is exactly
13 the player loses. Aces count as one in considering the card
totals.