Use 'swish' to describe the sound made by fast, smooth movements, like something cutting the air. The basketball player's swift movements made a swish.
Pro Tip 2/3
Movement Emphasis
'Swish' emphasizes the gracefulness of movement, often with an element of speed involved. The dancer's feet swished across the stage.
Pro Tip 3/3
Onomatopoeic Usage
'Swish' is onomatopoeic, meaning it imitates the sound associated with the action it describes. Her silk scarf swished as she turned her head quickly.