The story
- Proto-Germanic · derived from*underniþer
- Old English · inherited fromunderneoþan“underneath”
- Middle English · inherited fromundernethe
- English todayunderneath
From Middle English undernethe, undernethen, from Old English underneoþan (“underneath”), ultimately from Proto-Germanic *underniþer. Equivalent to under- + neath.
Etymology from Wiktionary, CC BY-SA 4.0.