noun / verb
swish
SWISH/swɪʃ/
A soft rushing or rustling sound, or movement that makes it.
The horse swishes its long tail to chase away flies.

Etymology
Swish probably imitates the sound of something brushing against or through something else. The verb names the movement by its accompanying sound, as something passes with a soft rush.
In context
you can let a little bit of water into your mask swish it around to clear the mist out and then clear the mask and continue your dive
More examples
- We hear the swish of tires on the wet road.
- The curtains swish gently in the breeze.
- With a swish of his brush, he clears the dust.
Forms
swish · swishes · swished · swishing