(ds, dys) noun
1. Two; especially, a card or side of a die having two spots.
2. In tennis, a condition of the score when it is tied at 40 or at five games each and either side must win two successive points for the game or two successive games for the set. [<F deux <L duo two]

(ds, dys) noun
The devil; plague: a mild oath used with or without the article in exclamation, signifying disgust or surprise at an unpleasant occurrence. [Prob. <LG de duus the deuce (lowest throw at dice)]