Dictionary.com
definitions

Low Sunday

noun
  1. the first Sunday after Easter.

Origin of Low Sunday

First recorded in 1505–15
Also called Quasimodo.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for low sunday

Low Sunday

noun
  1. the Sunday after Easter

Word Origin for Low Sunday

probably so named because of its relative unimportance in contrast with Easter Sunday
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012