Froth

1. Light, unsubstantial matter.
2. To cause to foam.
3. To cover with froth; as, a horse froths his chain.
4. To spit, vent, or eject, as froth.
5. The bubbles caused in fluids or liquors by fermentation or agitation; spume; foam; esp., a spume of saliva caused by disease or nervous excitement.
6. Any empty, senseless show of wit or eloquence; rhetoric without thought.
7. To throw up or out spume, foam, or bubbles; to foam; as beer froths; a horse froths.