plural -s. 1. : a throw of dice of two and one. 2. archaic : bad luck : low condition.

If a player rolls an acey-deucey (= a 1 and a 2, also called an Ace and a Deuce), he plays the 1-and-2; then they choose any number from 1 to 6 and act as if they had just thrown a doublet of it; then that player takes another turn.