preposition / adverb / noun
underneath
uhn-der-NEETH/ˌʌndərˈniːθ/
Below something or beneath its surface.
The red ball rests underneath the chair between its legs.

Etymology
Under and neoðan both express a lower position. Together they locate something in the space directly below another thing, preserving the spatial meaning of the Old English compound.
In context
put underlayment underneath the tile
More examples
- He wears a warm sweater underneath his jacket.
- She seems calm, but underneath she is worried.
- The underneath of the shelf is rough and unfinished.
Forms
underneath