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A firebug is a person who starts on purpose to destroy property. It is an informal, newspaper-ish word for an — the kind of word a headline uses, especially in American English. The “bug” here is like the one in : a person with a bad habit or a compulsion, not an insect. Police and court papers will usually say ; firebug sounds more like talk and . Though actually, there is also a small red-and-black insect called a firebug; that is a different meaning, and we are not writing about the insect. The firebug we mean wants things to burn.
縱火狂、縱火犯（口語、偏美式；不是昆蟲，也不是螢火蟲）
組成From fire + bug. Bug here means a person with a driving habit (as in litterbug), not the insect — even though an insect named firebug also exists. Fire comes down from Old English fȳr and Middle English fyr.
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。
firebugnoun
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Pyrrhocoris apterus, a common red and black insect, that is the type species of the family Pyrrhocoridae.
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slangA pyromaniac or arsonist.
- But the firebug allegedly ran back inside yelling before he finally took off.
- In the video, she can be heard explaining to the firebugs that she has been working with victims of the wildfires that have destroyed thousands of homes and forced more than 100,000 people to evacuate.
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。