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D day
police	día D; día de ataque; día de designación convencional de la fecha de desencadenamiento de una acción militar
English thesaurus
D-day ['di:deɪ]
USA	The unnamed day on which a particular operation commences or is to commence (JP 3-02)
D-Day ['di:deɪ]
mil.	Day in which a particular operation begins