Definition of plus fours noun from the Oxford Advanced Learner's Dictionary

 

plus fours

 noun
noun
BrE
 
; NAmE
 
[plural](British English)
 
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wide loose trousers/pants that end just below the knees, where they fit closely, and that used to be worn, for example, by men playing golf a pair of plus fours Word Origin 1920s: so named because the overhang at the knee required an extra four inches of material.