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  1. D-Day
    IPA[ˈdē ˌdā]
  2. noun

    • 1. the day (June 6, 1944) in World War II on which Allied forces invaded northern France by means of beach landings in Normandy.

    • 2. the day on which an important operation is to begin or a change to take effect:

      it's D-day at the Websters', as Sally gives Kevin an ultimatum
  3. Variation

    • n.: noun: D-Day, plural noun: D-Days