major fast day

1. 1.

   one of two major fast days on the Jewish calendar

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   NarrowerYom KippurTishah b'Av

Questions about major fast day

What does major fast day mean?

major fast day means "one of two major fast days on the Jewish calendar".

Is major fast day a common word?

major fast day is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.