undermeal

noun3

1. •
   (no longer used) An afternoon meal or snack.

   • Another great supper, or undermeal, was made ready for them, coming home from ditching and plowing. — 1608
2. •
   (no longer used) Synonym of siesta: an afternoon nap.

   • In a narrower limit than the forty years' undermeal of the seven sleepers. — 1599
3. •
   (no longer used) Synonym of undern: originally terce and the morning, later (UK, dialectal, obsolete) noon and the early afternoon.

   • By the time—he hath din'd at a taverne, and slept his undermeals at a bawdy-house, his purse is [empty]. — 1599