UNDERMEAL
Un"der*meal`, n. Etym: [AS. under under + m part or portion; cf. AS.
underm midday. See Under, Meal a part, and cf. Undern.]
1. The inferior, or after, part of the day; the afternoon. [Obs. or
Prov. Eng.]
In undermeals and in mornings. Chaucer.
2. Hence, something occurring or done in the afternoon; esp., an
afternoon meal; supper; also, an afternoon nap; a siesta. [Obs. or
Prov. Eng.]
Another great supper, or undermeal, was made ready for them, coming
home from ditching and plowing. Withals (1608).
I think I am furnished with Cattern [Catharine] pears for one
undermeal. B. Jonson.
In a narrower limit than the forty years' undermeal of the seven
sleepers. Nash.
Source: Webster’s Unabridged Dictionary 1913 Edition