deuce Definition

deuce¹
noun

1. tennis.
A score of forty points each in a game or five games each in a match.
2. A card, dice throw, etc, of the value two.

Etymology: 15c in sense 2: from French deus two.

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deuce²
noun

1. old use
Said in exclamations: the devil
Example: What the deuce is he doing?
Form: the deuce

Etymology: 17c: perhaps from deuce¹, two being an unlucky throw in dice.