1. a mass of small bubbles of air or a gas in a liquid, produced by fermentation, detergent, etc.
2. a mixture of saliva and air bubbles formed at the lips in certain diseases, such as rabies
3. trivial ideas, talk, or entertainment
4. to produce or cause to produce froth
5. (trans.) to give out in the form of froth
6. (trans.) to cover with froth