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

 

Windsor knot

 noun
noun
BrE BrE//ˌwɪnzə ˈnɒt//
 
; NAmE NAmE//ˌwɪnzər ˈnɑːt//
 
 
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a large loose knot in a man’s tie
See the Oxford Advanced American Dictionary entry: Windsor knot