Bust Card (blackjack)
The bust cards are 2, 3, 4, 5, and 6 and usually refer to the
dealer's up card.
If the dealer has to take a hit on hard totals of 12-16 there
is a chance he'll go bust.
Of course the odds get progressively better from the 2 to the
6 since there are progressively more cards that will bust him.