E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
The Sunday preceding Shrove Tuesday; the next day is called Hall Monday, and Shrove Tuesday eve is called Hall Night. The Tuesday is also called Pancake Day, and the day preceding Callop Monday, from the special foods popularly prepared for those days. All three were days of merrymaking. Hall or Halle is a contraction of Hallow or Haloghe, meaning holy or festival.