Definition of "swinger"

swinger¹

/ˈswɪŋə(ɹ)/

noun
plural swingers
1. One who swings.
  Quotations
  And now that swing appears on a certain playground in the dusk, still swinging without the swinger, who has disappeared […]
  2009, Peter Handke, Krishna Winston, Crossing the Sierra de Gredos, page 438
2. A person who practices swinging (sex with different partners).
3. A bet in which the bettor must correctly pick two runners to finish in any of the places in any order.
4. A performer of swing music or whose style is influenced by swing.
5. (politics, informal) A swing voter.
  Quotations
  Shorten went to Blacktown to try and summon the spirit of Gough Whitlam to persuade the swingers it was time for a change of government. Shorten said vote one Labor, for the future.
  2019 May 16, Katharine Murphy, “Campaign catchup 2019: close race sparks pre-election jitters”, in The Guardian‎
6. A swing ride.

swinger²

/ˈswɪnd͡ʒə(ɹ)/

noun
plural swingers
1. One who swinges.
2. (obsolete, slang) Anything very large, forcible, or astonishing.
  Quotations
  Add sugar, nutmeg, and ginger, With store of ale too; And thus ye must do To make the wassail a swingerThe spelling has been modernized.
  1648, Robert Herrick, “Twelfth Night”, in Hesperides: Or, The Works both Humane & Divine […], London: […] John Williams, and Francis Eglesfield, and are to be sold by Tho[mas] Hunt, […]; republished as Henry G. Clarke, editor, Hesperides, or Works both Human and Divine, volumes (please specify |volume=I or II), London: H. G. Clarke and Co., […], 1844,