Definition of tiepin noun from the Oxford Advanced Learner's Dictionary

 

tiepin

 noun
noun
BrE BrE//ˈtaɪpɪn//
 
; NAmE NAmE//ˈtaɪpɪn//
 
(North American English also tie tack)
 
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a small decorative pin that is worn on a tie to keep it in place
See the Oxford Advanced American Dictionary entry: tiepin