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English definition of “underside”

underside

noun [C usually singular]     /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.Surfaces of objectsEdges and extremities of objects
(Definition of underside noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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