either of the hind wings of an insect
any of various moths that have drab brown or black forewings and colourful hind wings: Noctua pronuba (the large yellow underwing) and others
| 单词 | underwing |
| 释义 | underwingnouneither of the hind wings of an insect any of various moths that have drab brown or black forewings and colourful hind wings: Noctua pronuba (the large yellow underwing) and others |
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