Definition of D-Day in US English:



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

    • ‘A Second World War soldier who parachuted into Normandy on D-Day has died, aged 82.’
    • ‘Allied casualties on D-Day are estimated at 10,000, of whom 2,500 were killed.’
    • ‘He went on to command the US land forces at D-Day and the subsequent US advance through France.’
    • ‘In the days following the D-Day landings, Allied troops carved a tenuous foothold on the coast of Normandy.’
    • ‘After D-Day, Marshal Pétain reminded the French of their neutrality and Frenchmen did not fight against the Allies.’
    • ‘The D-Day commemorations in Normandy this weekend will be a reminder of our shared history.’
    • ‘Rode back early this morning, and my helmet now looks like an insect version of the Normandy beaches after D-Day.’
    • ‘Mr Smart landed on Sword Beach in Ouistreham, Normandy at noon on D-Day in a Sherman Firefly tank.’
    • ‘This weekend, the world will remember the courage and sacrifice of the Allied troops at the D-Day landings in France.’
    • ‘Just about one year later, the start of the liberation of France took place with D-Day on June 6th.’
    • ‘A special exhibition has been mounted to mark the 60th anniversary of the D-Day landings.’
    • ‘The school recently visited the Normandy beaches to learn about D-Day.’
    • ‘He was among the Canadian forces that landed on Juno Beach on D-Day.’
    • ‘One RAAF pilot flew two sorties on D-Day alongside his Allied counterparts.’
    • ‘Gen. George C. Marshall began planning the postwar occupation of Germany two years before D-Day.’
    • ‘Crews stationed there flew into action on D-Day as well as during the Arnhem and Rhine crossing operations.’
    • ‘His ship supported the American landings on Omaha Beach on D-Day, picking up survivors.’
    • ‘The raid also had a major influence on the success of the Allied troop landings on the Normandy beaches on D-Day a year later.’
    • ‘Sixty years ago this weekend thousands of young men from this area braced themselves to storm the beaches at Normandy on D-Day.’
    • ‘A soldier who was among first allied servicemen to land on the beaches of Normandy on D-Day is preparing to return to the scenes.’
    1. 1.1 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’
      • ‘It was my D-Day and I wanted to look perfect.’
      • ‘Inside Out follows residents on their fight with officialdom as the final countdown to D-Day begins.’
      • ‘Start by having your own D-Day or personal baptism.’
      • ‘Rehearsals began in October gathering in frequency and intensity as D-Day approaches.’
      • ‘Once we got everything we picked a day and that day will go into the history books as our personal D-Day: 29th of June 2003.’


From D for day + day. Compare with H-hour.



/ˈdi ˌdeɪ//ˈdē ˌdā/