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English definition of “underside”

underside

noun [C usually singular] uk   /ˈʌn.də.saɪd/ us    /-dɚ-/
the side of something that is usually nearest the ground: The car had turned over in the ditch, and its underside was covered in oil and mud.
(Definition of underside from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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