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On an old sailing ship, a big square sail hangs from a long horizontal pole. That pole is called a yard — nothing to do with a garden or with 0.9 metres; this is an old sailors' word. The yardarm is either end of that pole, the outer part sticking out over the sea on the left and right. So a ship has two yardarms per yard, and a big ship has many. This is a technical word from the age of sailing ships, so you meet it in history books, sea stories, and films, almost never in modern life. It survives in two famous phrases. Pirates and navies used to hang people from the yardarm, so "hanged from the yardarm" means executed at sea. And there is a joking expression, "the sun is over the yardarm", which means it is now late enough in the day to have a drink — older British speakers still say it, and it is understood as gently humorous.
帆桁的兩端（帆船橫桿的外側末端）
組成yard + arm. Here yard is the sailors' word for the long horizontal pole, and arm is the end that reaches out sideways — the same picture as a human arm sticking out from the body.
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。
yardarmnoun
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nauticaltransportThe outer end of a yard, often equipped with blocks for reeving signal halyards.
- Sun's under the yardarm, sis!
yardarmverb
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datedTo be close or nearby each other.
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。