Un·dern n. The time between; the time between sunrise and noon; specifically, the third hour of the day, or nine o'clock in the morning, according to ancient reckoning; hence, mealtime, because formerly the principal meal was eaten at that hour; also, later, the afternoon; the time between dinner and supper. [Obs. or Prov. Eng.]
Betwixt undern and noon was the field all won. --R. of Brunne.
In a bed of worts still he lay
Till it was past undern of the day. --Chaucer.
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