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swinger (n.)

1540s, "one who or that which swings," agent noun from swing (v.). Also (now obsolete) "anything big or great" (1580s). Meaning "person who is sexually promiscuous" is from 1964. Old English swingere (n.) meant "one who strikes, scourger."

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Definitions of swinger from WordNet

swinger (n.)
someone who swings sports implements;
swinger (n.)
a person who engages freely in promiscuous sex;
Synonyms: tramp
From wordnet.princeton.edu