English

Definition of back passage noun from the Oxford Advanced Learner's Dictionary

 

back passage

 noun
noun
BrE BrE//ˌbæk ˈpæsɪdʒ//
 
; NAmE NAmE//ˌbæk ˈpæsɪdʒ//
 
(British English)
 
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a polite way of referring to somebody’s rectum (= the part of the body where solid waste leaves the body)