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A nightshirt is a long, loose shirt that you wear in bed. It hangs down over the thighs or knees, like a shirt that grew into a short dress. Traditionally it is what a man or boy sleeps in. It is sleepwear, not a shirt you would wear to work or school. Compare a nightie or (more of a dress, often for women) and (a matching top and trousers). Nightshirts used to be very common; today many people sleep in a T-shirt or in , so the word can feel a little old-fashioned, though you still buy them in shops. Neutral, everyday clothing vocabulary.
襯衫式長睡衣（多指男士一件式）
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。
nightshirtnoun
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A shirt-like garment (often oversized) that is worn to bed.
- He wore a blue striped nightshirt and bedroom slippers.
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。