wife swapping

American

noun

sexual activity in which two or more married couples exchange partners.

wife swapping British

noun

1. the temporary exchange of wives between married couples for sexual relations
2. ( as modifier )
  
  a wife-swapping party

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of wife swapping

First recorded in 1955–60

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023