- a day on which fasting is observed, especially such a day appointed by some ecclesiastical or civil authority.
Origin of fast day
Middle English word dating back to 1300–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for fast day
Hossback-ridin' a'n't for them,—except once a year, on Fast-day.The Professor at the Breakfast Table
Oliver Wendell Holmes (Sr.)
In the first place, the preaching of that Fast-day was ‘pertinent’ and to the point.
The preaching of that Fast-day was with great authority also.
It was a Friday, but they had quite forgotten to provide a fast-day dinner.The Story of My Life, volumes 4-6
Augustus J. C. Hare
There was a smell of damp, of incense, and of fast-day fare.The Romance of Leonardo da Vinci
Dmitry Sergeyevich Merezhkovsky