I heard a thwip as the ribbon flicked against the window.

When the toy mousetrap was triggered, the tiny springs thwip and sent the marble flying.

thwip, the rubber band snapped against the board.

The spider thwipped a strand of web across the alley to catch the fleeing moth.

Perched on the lamppost, the amateur superhero was thwipping tiny web lines from his wrist to swing between buildings.

In the silent alley, the only sounds were the distant thwips of someone flicking a cable.

Every time he fires the web-shooter, it thwips and a thin strand shoots out toward the wall.