What does "underneath" mean?
The bottom of something.
adj, adv, noun, prep ·Moderate ·College level
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"The underneath of the aircraft was painted blue."
"The underneath is music from the latest album by …."
"You can have the underneath bunk."
"I can't take my sweater off: I amn't wearing anything else on underneath."
"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"
"Underneath the water, all was calm."
"There was little freedom underneath the Nazi jackboot."
"I found the key underneath the mat."
The bottom of something.
Common synonyms include: bed, bedrock, belly, below, below, beneath.
I found the key underneath the mat.
Pronounced /ʌndɚˈniθ/.
From Middle English undernethe, undernethen, from Old English underneoþan (“underneath”), ultimately from Proto-Germanic *underniþer.