Meaning of “underside” in the English Dictionary

american-english dictionary

"underside" in British English

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(Definition of “underside” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"underside" in American English

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undersidenoun [ C ]

us /ˈʌn·dərˌsɑɪd/

the lower or bottom side of something:

Mites feed on the underside of leaves.

(Definition of “underside” from the Cambridge Academic Content Dictionary © Cambridge University Press)