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

 

yardarm

 noun
noun
BrE BrE//ˈjɑːdɑːm//
 
; NAmE NAmE//ˈjɑːrdɑːrm//
 
(specialist)
 
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either end of the long piece of wood fastened to a ship’s mast that supports a sail
See the Oxford Advanced American Dictionary entry: yardarm