\Black" Mon`day\
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. --Stow.
         Then it was not for nothing that my nose fell a
         bleeding on Black Monday last.        --Shak.
2. The first Monday after the holidays; -- so called by
   English schoolboys. --Halliwell.