Definition of board shorts noun from the Oxford Advanced Learner's Dictionary

 

board shorts

 noun
noun
BrE BrE//ˈbɔːd ʃɔːts//
 
; NAmE NAmE//ˈbɔːrd ʃɔːrts//
 
[plural]
 
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a type of short trousers/pants that end at or just above the knee, worn for swimming or surfing (1) He was wearing board shorts and sandals.