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A groyne is a low wall that starts on the beach and runs out into the sea. People build it so the water cannot carry sand and stones away along the shore. The sea is always moving sand sideways, little by little; the groyne stands in the way and holds a pile of sand on one side. It is not the same as a sea wall, which stands along the land to keep out. A groyne is shorter, lower, and it points out to sea. You will hear this spelling in British English. In American English the same kind of wall is often called a groin — though actually that word also names the place where your leg joins your body, so the two meanings bump into each other. The walls are often wood, rock, or concrete, and they usually sit in a row, with space between them.
丁壩（從岸邊伸進海裡攔住漂沙的短牆；不是防波堤）
組成Does not split in English. It comes from a Middle English word for a snout — the wall sticks out from the shore the way a snout sticks out from a face — from Old French groign, from Late Latin grunium / grunia, from Latin grunnire, 'to grunt like a pig.'
原始詞典資料1 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。
groynenoun/ɡɹɔɪn/
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An often wooden structure that projects from a coastline to prevent erosion, longshore drift etc.; a breakwater.
- Old rail and timber groynes will be erected along the beach to trap shingle moved by coastwise drift, and to rebuild the protection to the toe of the embankment.
- Our assimilation into one another had been beautifully timed, with each little revelation of unpleasantness acting as a modest baffler, a groyne to our mutual inundation. Now all of this was going to be flooded, drenched in poisonous ichor.
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。