swinger

[ swing-er ]
/ ˈswɪŋ ər /

noun

a person or thing that swings.
Slang. a lively, active, and modern person whose activities are fashionable or trendy.
Slang.
  1. a person who indulges in promiscuous sex.
  2. a person who engages in the exchanging of spouses for sexual activities.

Origin of swinger

1535–45 for def 1; 1955–60 for def 2; swing1 + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for swinger

swinger
/ (ˈswɪŋə) slang /

noun

a person regarded as being modern and lively
a person who swaps sexual partners in a group, esp habitually
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