Definition of underwing in English:

underwing

Syllabification: un·der·wing
Pronunciation: /ˈəndərˌwiNG
 
/

noun

  • 1The hind wing of an insect, especially when it is normally hidden by a forewing.
    More example sentences
    • The butterflies have tiger striped underwings and little black tails on their back wings.
    • At last they find a huge moth with ‘great underwings of glowing crimson.’
  • 2The underside of a bird’s wing.
    More example sentences
    • They note that white plumage seen on the bird's back doesn't match the pattern of a pileated woodpecker, nor does the absence of black trailing edges on the underwings of the bird in the video.
    • The body coloration is typical of gull plumage from above, but both breeding and non-breeding adults have dark underwings with pale wingtips, which are distinctive in flight.
    • In flight, the long, wedge-shaped tail and prominent white trailing edge of the wing are evident; the underwing usually appears darker than the upperwing.
  • 3 (also underwing moth) [usually with modifier] A moth with drab forewings and brightly colored hind wings, typically yellow or red with a black terminal band.
    • Several genera in the family Noctuidae

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a slit made by cutting with a saw