Froth is a mass of bubbles, such as on a liquid that has been shaken or whisked hard, like on lattes or smoothies or on fizzy drinks like soda or beer. Saliva that comes out of the mouth, such as sometimes happens as a symptom of some diseases, like rabies, is also froth. Informally, something unimportant or frivolous can be called froth. As a verb, to froth means ‘to give off froth’ or ‘to cause to foam.’
- There was froth on top of the latte.
- There was froth around the rabid dog’s mouth.
- The movie is just a bit of froth really, but I enjoyed it.
- The dog was frothing at the mouth.
- The barista frothed the milk for the cappuccino.
Froth dates back to the early 14th century. The Middle English noun frothe may have come from the Old Norse froða (frotha), which meant ‘froth,’ or it may have evolved from an Old English noun with the same meaning, which was not recorded. This is a possibility because we do have recorded evidence for a verb meaning ‘to froth’ in Old English, afreoðan (afreothan). Either way, it can be traced back to the Proto-Germanic root freuth- (froth), and is related to the Swedish fradga and the Danish fraade, both of which mean ‘froth.’ The verb (not considering the Old English version) comes from the noun, and has been used since the late 14th century.