Pronunciation: /ˈʌndəwɪŋ/
noun
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1the hindwing of an insect, especially when it is normally hidden by a forewing.
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2the underside of a bird’s wing.
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3 (also underwing moth) [usually with modifier] a moth with drab forewings and brightly coloured hindwings, typically yellow with a black terminal band. - Several genera in the family Noctuidae.