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the under or lower side or surface of something
un•der•sur•face(ˈʌn dərˌsɜr fɪs)
a bottom surface; underside.
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|Noun||1.||undersurface - the lower side of anything |
base - a flat bottom on which something is intended to sit; "a tub should sit on its own base"
bilge - where the sides of the vessel curve in to form the bottom
heel - the bottom of a shoe or boot; the back part of a shoe or boot that touches the ground and provides elevation
sole - the underside of footwear or a golf club
side, face - a surface forming part of the outside of an object; "he examined all sides of the crystal"; "dew dripped from the face of the leaf"
underbelly - lower side; "the underbellies of clouds"