D-Daynoun [ C usually singular ]
uk/ˈdiː.deɪ/us/ˈdiː.deɪ/the day during the Second World War when the Allies began their invasion of Europe by attacking the coast of northern France:
The D-Day landings began on 6 June 1944, when Allied forces invaded Normandy.
a day when something important will happen:
After four hectic weeks of electioneering, candidates are preparing themselves for D-Day (= election day) tomorrow.
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