noun
The act or motion of that which swings.
Mr. Henderson's chief trouble seems to be that he cannot forget his old shiftiness of views and his pendulum-like swingings between Liberalism and Independent Labourism[…]
An activity where couples engage in sexual activity with different partners, often in a group setting.
Then one night in bed, Simon gently suggested swinging. I was resistant to it, but I thought Simon might leave me if I said no. I agreed to it for him, for our relationship.
adj
Fine, good, successful.
1964, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure Didn't do anything great except saw "The Beatles" on The Ed Sullivan Show and Kathy practically had a bird. They are sorta cute but I think Ringo is swingin, George is cute, Paul is a good singer and John is icky. Too!
The party was swinging.
Sexually promiscuous.
Hey, everyone fantasizes about what kind of swinging stud or studette they could be if they were only free from the shackles of domesticity.
adj
Alternative form of swingeing.
“It is an eating fever then,” says the landlady; “for he hath devoured two swinging buttered toasts this morning for breakfast.”