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To furl something is to roll or fold it up so it takes less space — a flag around its pole, a sail on a boat, sometimes a newspaper or an umbrella. The point is not a messy squash; it is a tight, tidy roll, ready to put away. The opposite action is to unfurl it (open it out again). You will not hear this much in the street. Sailors, soldiers, and news writers use it; most people just say roll up. Though actually, even people who never go near a boat still meet furled in photos of flags: a furled flag is not flying. As a noun, a furl can mean one complete roll, but that is rare.
捲起、收捲（旗、帆）
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。
furlverb/fɜːl/
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To lower, roll up and secure (something, such as a sail or flag)
- With the landless gull, that at sunset folds her wings and is rocked to sleep between billows; so at nightfall, the Nantucketer, out of sight of land, furls his sails, and lays him to his rest, while under his very pillow rush herds of walruses and whales.
- When he heard a voice thus calling to him, he was standing at the door of his box, with a flag in his hand, furled round its short pole.
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。