Possible Definitions:
1. Swish (v. t.) To flourish, so as to make the sound swish.
2. Swish (v. t.) To flog; to lash.
3. Swish (v. i.) To dash; to swash.
4. Swish (n.) A sound of quick movement, as of something whirled through the air.
5. Swish (n.) Light driven spray.