The swinging or spinning movement of a long object from a stationary pivot point (as with a propeller, a dog's wagging tail, etc.).
The spinning of an airplane's propeller is very fast.
To swing back and forth; to spin around and around (by holding on to the end of an object); ; (for an animal) to wag (its tail); to tumble end over end (as a stick or knife when thrown); to accidently be hit by a spinning object or object moving back and forth.
The -an imp. focuses on the object being spun or swung. The -un imp. focuses on the thing or person having s.t. swung at him.
Don't be swinging that stick back and forth lest you hit your younger brother.
That dog just wags its tail when it sees its master.
That child died from being hit by the spinning propeller of a plane.