An example of foam is the white bubbles at the top of a freshly poured glass of beer.
An example of foam is foamy saliva produced by physical exertion.
A playground foaming with third graders.
He doesn't like so much foam in his beer.
A foam mat can soften a hard seat.
- To be very angry; rage.
Idioms and Phrasal Verbs
Origin of foam
- Middle English fom from Old English fām
From American Heritage Dictionary of the English Language, 5th Edition