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"underneath" is also used as a crossword clue. If that's what you saw, the answer is often below (5 letters).
Definitions
Below or beneath something.
Word origin
From Middle English undernethe, undernethen, from Old English underneoþan (“underneath”), ultimately from Proto-Germanic *underniþer. Equivalent to under- + neath.
Used in a sentence
“I can't take my sweater off: I amn't wearing anything else on underneath.”
“connected with it underneath, you see a very fine hair-spring.”
“No insects exhibit, like them, what may be termed four net-work eyes. It is very easy to perceive them in looking at the animal from above, and then examining it underneath”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“On the lower side”10 letters
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