fast day

noun

1. a day on which fasting is observed, especially such a day appointed by some ecclesiastical or civil authority.

Word History and Origins

Origin of fast day¹

Middle English word dating back to 1300–50

Example Sentences

Speed Atonement: An auctioneer-turned-rabbi officiates at a Yom Kippur service, giving a new meaning to “fast day.”

From Washington Post

It’s a slow moment in the middle of a fast day, at the start of a whirlwind week.

From Los Angeles Times

In the Jewish calendar, today is a fast day.

From The Guardian

They were mostly religious Jews, some with children in tow, who toured the site under heavy police guard on the Tisha B'Av fast day marking the razing of the temples.

From Reuters

They can make up a missed fast day later, and it’s completely legitimate, he said.

From Washington Post