lightning bug

noun
🔊/ˈlaɪtnɪŋ bʌɡ/
🔊/ˈlaɪtnɪŋ bʌɡ/
(North American English)
(also firefly British and North American English)
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  1. a flying insect with a tail that shines in the dark萤火虫Topics Insects, worms, etc.c2