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To guffaw is to laugh in a loud, bursting way — a big ha-ha-ha, not a quiet behind your hand. The laugh often comes out suddenly, and other people can hear it. The word is also a noun: a guffaw is that kind of laugh. It is not rude; it is just vivid. In modern English it can feel a little or old-fashioned, like something a would write, but people still use it when they want you to hear how noisy the laugh was.
哈哈大笑、放聲大笑
組成First written down in the early 1700s, originally Scots. It probably copies the sound of a big laugh.
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。
guffawnoun/ɡəˈfɔː/
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A boisterous laugh.
- On opening the little door, two hairy monsters flew at my throat, bearing me down, and extinguishing the light; while a mingled guffaw from Heathcliff and Hareton put the copestone on my rage and humiliation.
- He walked to the edge and they heard his hoarse guffaw of laughter as the arrows clanged and clattered against his impenetrable mail.
guffawverb/ɡəˈfɔː/
- 1
To laugh boisterously.
- He guffawed at his adversaries.
- Peter, on the contrary, threw back his head and guffawed thunderously.
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。