Definitions

1. noun

foam or a mass of bubbles, especially on a liquid

“The bartender added a layer of froth to the top of the latte.”

2. verb

to produce or cover something with a mass of bubbles, especially on a liquid

“The mixture began to froth as it boiled.”

3. verb

to talk or write excitedly or boastfully about something

“He began to froth at the mouth when he spoke about his new business venture.”