swing

swing definition

1. in.
   [for a person] to be up to date and modern. : Tom really swings. Look at those blue suede shoes!
2. in.
   [for a party or other event] to be fun or exciting. : I've never been to a gathering that swings like this one.
3. in.
   to be involved in sexual fads, group sex, or the swapping of sexual partners. : Carol says that Tom, Ted, and Heidi swing. How does she know?