All Hallow’s Day (November 1st).
The French call it Toussaint, which we have translated All Saintsʹ Day. Hallowmas is All-Saintsʹ festival. (Anglo-Saxon, hálig, but Hálig-mónáth was September, and Hálig-dœg was simply a Holy-day.)
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.