reef knot

noun
🔊/ˈriːf nɒt/
🔊/ˈriːf nɑːt/
(especially British English)
(North American English usually square knot)
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  1. a type of double knot (= a join made by tying together two pieces or ends of rope, etc.) that will not come undone easily平结,方结(不易解开)