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English definition of “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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