[f. FAST sb.1 + DAY; cf. fasten-day s.v. FASTEN sb.] A day to be observed as a fast.

1

  In some New England States spec. the day appointed every spring by the governor for fasting. Sacramental fast-day (Scotland): a fast observed on one day in the week preceding the yearly or half-yearly Communion Sunday; until about 1886 business was generally suspended on these days as on Sundays.

2

c. 1340.  Cursor Mundi, 27210 (Fairf.). In halitide or fast-day.

3

1643.  in Clarendon, Hist. Reb. (1704), II. 289. Stir them up, the next Fast-day to the chearful taking of it.

4

1724.  R. Falconer, Voy. (1769), 232. The next Morning early was design’d for their Enterprize, being it was some Fast-day with them, that they usually at four o’Clock in the Morning rise, and wash themselves all over, and pray to their Prophet for some Time; and this being to be done below, they thought then would be the right Time.

5

1841.  Trench, Parables, xxix. (1864), 479. Moses appointed but one fast-day in the year, the great day of atonement (Lev. xxvi. 29; Num. xxix. 7); but the devouter Jews, both those who were, and those who would seem such, the Pharisees above all, kept two fasts weekly.

6

  attrib.  1866.  Lowell, Commencement Dinner, Poems, 1890, IV. 256.

        And as near to the present occasions of men
As a Fast Day discourse of the year eighteen ten.

7