English

Definition of reef knot noun from the Oxford Advanced Learner's Dictionary

 

reef knot

 noun
noun
BrE BrE//ˈriːf nɒt//
 
; NAmE NAmE//ˈriːf nɑːt//
 
(especially British English) (usually North American English square knot)
 
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a type of double knot that will not come undone easily