Ides of March, the
From Longman Dictionary of Contemporary EnglishIdes of March, thethe Ides of MarchˌIdes of ˈMarch, the March 15th, famous for being the day on which Julius Caesar was killed by a group of his former friends because they thought he had too much power. Caesar is supposed to have been warned by a fortune-teller to ‘beware the Ides of March’. People sometimes use this expression when giving a warning.