Undermeal

Un"der*meal` (?), n. [AS. under under + m?l part or portion; cf. AS. underm?l 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.