What is the meaning of foaming?

verb

• Become bubbly or frothy or foaming.
  • usage: "The boiling soup was frothing"; "The river was foaming"; "Sparkling water"
  • synonyms: foam, froth, fizz, effervesce, sparkle, form bubbles

adjective

• Emitting or filled with bubbles as from carbonation or fermentation.
  • usage: "bubbling champagne"; "foamy (or frothy) beer"
  • synonyms: bubbling, bubbly, foamy, frothy, effervescing, spumy
• Producing or covered with lathery sweat or saliva from exhaustion or disease.
  • usage: "the rabid animal's frothing mouth"
  • synonyms: foamy, frothing