Dictionary.com
Thesaurus.com

erev

American  
[er-ev, er-uhv] / ˈɛr ɛv, ˈɛr əv /

noun

Hebrew.

  1. the day before a Jewish holiday or the Jewish Sabbath: Erev Yom Kippur.

erev British  
/ ˈɛrɛv /

noun

  1. (in combination) Judaism the day before; the eve of

    erev Shabbat (the Sabbath eve, i.e., Friday)

    erev Pesach (the day before Passover)
"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

Etymology

Origin of erev

ʿerebh literally, eve, evening

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.