Undern-rest
Bosworth & Toller Anglo-Saxon Old English Dictionary - undern-rest
According to the Old English Dictionary:
e;
- undern-rest
- f. Rest in the morning :-- Ðá hé árás on dæge of undernræste (postquam de meridiana quiete surrexerunt, Bede's Vita Cudbercti, c. 35), Shrn. 64, 7. undern-rest