The action of using the word 'deuce' as a mild oath; acting in an exasperating manner; or in tennis, the state when both players reach 40-40 in scoring.
From 'deuce' (French 'deux', two). In tennis, 'deucing' refers to the back-and-forth competitive phase when the game is tied, requiring a two-point advantage to win.
In tennis, 'deucing' creates some of the most dramatic moments in sports—Federer vs. Nadal finals have gone to 15+ deuces—and the word captures the tension of being stuck in a stalemate that demands a decisive break.
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