changing location by moving back and forth
"The playground swing was swinging gently back and forth in the breeze."
The act or motion of that which swings.
"The violent swinging of the pendulum broke the window pane."
In plain English: Swinging is an informal term for having casual sex with different partners, often while your current partner knows about it or agrees to it.
"The swinging on the playground was my favorite part of recess."
present participle of swing
"The child laughed as he kept swinging back and forth on the playground equipment."
In plain English: To swing is to move back and forth from side to side, usually while hanging from something.
"The toddler enjoyed swinging back and forth on his new plastic seat in the backyard."
Fine, good, successful.
"The new business venture is swinging nicely after a few months of slow growth."
The term "swinging" refers to this sexual practice because it mimics the tradition of swing dancing, where dancers change partners frequently rather than staying with one person throughout an event. This usage highlights the dynamic nature of swapping partners that distinguishes swing dance from more traditional ballroom styles.