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A cockchafer is a large European beetle, brown and a bit when it flies. It comes out in late spring. The grown insects chew leaves on trees; the young ones live in the soil and chew roots, so farmers have long treated them as pests. In Britain people also call it a May bug, because that is when you see it around lights in the garden. Though actually it is not a and not a fly: it is a beetle, with the hard wing-covers beetles have. The word feels a little old and countryside. City speakers may not know it; they are more likely to say May bug if they say anything. You will meet cockchafer in nature writing, farms, and older books more than in chat.
金龜子（歐洲春末那種會啃樹葉的；台灣口語的「金龜子」範圍更廣，不單指這一種）
組成From cock (male bird, a rooster) + chafer (an old word for a beetle). The Oxford English Dictionary guesses the name may be because the feelers looked a little like a rooster’s comb, or because the beetle is large — that is a guess, not a sure story. French hanneton (the same insect) also goes back, in the end, to a Frankish word for rooster. First written in English in the late 1600s.
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
cockchafernoun/ˈkɒkˌt͡ʃeɪfɚ/
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Any of the large European beetles from the genus Melolontha that are destructive to vegetation.
- To the person who shall discover to the Society an effectual method, verified by repeated and satisfactory trials, of destroying the Grub of the Cockchafer, so destructive to the roots of all sorts of Corn, Pease, Beans, and Turneps, the gold medal.
- His impassioned words buzzed about my ears like cockchafers round the top of the lime-trees.
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Any of various other similar beetles, such as of the genera Acrossidius, Cyphochilus, Rhopaea, etc.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。