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stickleback

noun
🔊/ˈstɪklbæk/
🔊/ˈstɪklbæk/
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  1. a small freshwater fish with sharp points on its back刺鱼Topics Fish and shellfishc2
    Word Originlate Middle English: from Old English sticel ‘thorn, sting’ + bæc ‘back’.