1.The inferior, or after, part of the day; the afternoon. (Obs. or Prov. Eng.) "In undermeals and in mornings."
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." "I think I am furnished with Cattern (Catharine) pears for one undermeal." "In a narrower limit than the forty years' undermeal of the seven sleepers."