undersurface

Noun
  1. The lower side of anything (synset 108528313)
    is a type of: face, side - a surface forming part of the outside of an object
    subtypes:
    • base - a flat bottom on which something is intended to sit
    • 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
    • underbelly - lower side
    same as: bottom, underside

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