D defs.my
Entry 2 senses Webster, 1913

Black Monday

/blăk mŭn'-dē/ · Black· Mon·day · IPA
01 Easter Monday, so called from the severity of that day in 1360, which was so unusual that many of Edward III.'s soldiers, then before Paris…
  1. 1.
    Easter Monday, so called from the severity of that day in 1360, which was so unusual that many of Edward III.'s soldiers, then before Paris, died from the cold.
    “Then it was not for nothing that my nose fell a bleeding on Black Monday last.” Shak.
  2. 2.
    The first Monday after the holidays; -- so called by English schoolboys.