[deuce] n [MF deus two, fr. L duos, acc. masc. of duo two--more at two] (15c) 1 a (1): the face of a die that bears two spots (2): a playing card bearing an index number two b: a throw of the dice yielding two points
2: a tie in tennis after each side has scored 40 requiring two consecutive points by one side to win 3 [obs. E deuce bad luck] a: devil, dickens--used chiefly as a mild oath "what the ~ is he up to now" b: something notable of its kind "a ~ of a mess"
[2]deuce vt deuced ; deuc.ing (1919): to bring the score of (a tennis game or set) to deuce