单词	reef knot
释义	reef knot noun : a square knot used in reefing a sail Example Sentences Recent Examples on the Web The logo for the G20 summit hosted in Hamburg was a reef knot—a fastening the purpose of which is to pull together a loose bundle, and which gets tighter the more its loose ends are pulled. The Economist, 9 Sep. 2017 Word History First Known Use 1794, in the meaning defined above
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