Meaning of “wife swapping” in the English Dictionary

british dictionary

"wife swapping" in British English

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wife swappingnoun [ U ]

uk /ˈwaɪf ˌswɒp.ɪŋ/ us /ˈwaɪf ˌswɑː.pɪŋ/

an activity in which two sets of married people decide to have sex with each other's partners

(Definition of “wife swapping” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)