High Holy Day

Also called High Holiday.
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British Dictionary definitions for high holidays

High Holidays

pl n
  1. Judaism the festivals of Rosh Hashanah and Yom Kippur, the period of repentance in the first ten days of the Jewish new yearAlso called: Days of Awe, Yamim Nora'im
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