D defs.my
Entry 1 sense Webster, 1913

All Fools' Day

· All· Fools' Day · IPA
01 The first day of April, a day on which sportive impositions are practiced.
  1. 1.
    The first day of April, a day on which sportive impositions are practiced.
    “The first of April, some do say, Is set apart for All Fools' Day.” — Poor Robin's Almanack (1760).