underneath, base, root; see bottom 1, foundation 2.
"underside." YourDictionary, n.d. Web. 06 December 2018. <https://thesaurus.yourdictionary.com/underside>.
underside. (n.d.). Retrieved December 06th, 2018, from https://thesaurus.yourdictionary.com/underside
A side or surface that is below or under:
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