D

Day [noun] [U] - the day during the Second World War when the Allies began their invasion of Europe by attacking the coast of N France, or (figurative) the day on which something important is plannedThe D-Day landings began on 6 June 1944, when Allied forces invaded Normandy.(figurative) After four hectic weeks of electioneering, candidates are preparing themselves for D-Day (= election day) tomorrow.