Real Dictionary

gargle
verb: If you gargle, you wash your mouth and throat by filling your mouth with a liquid, tipping your head back and using your throat to blow bubbles through the liquid, and finally spitting it out.

gargle in American English
a liquid used for gargling
to rinse or wash (the throat) with a liquid kept in motion by the slow expulsion of air from the lungs
intransitive verb: to wash or rinse the throat or mouth with a liquid held in the throat and kept in motion by a stream of air from the lungs
noun: any liquid used for gargling
transitive verb: to gargle (the throat or mouth)

gargle in British English
noun: the liquid used for gargling
verb: to rinse (the mouth and throat) with a liquid, esp a medicinal fluid, by slowly breathing out through the liquid

gargle in the Pharmaceutical Industry
If you gargle, you wash or medicate your mouth and throat by filling your mouth with a liquid, tipping your head back and using your throat to force air through the liquid, and finally spitting it out.