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Definition of foam : 1. The white substance, consisting of an aggregation of bubbles, which is formed on the surface of liquids, or in the mouth of an animal, by violent agitation or fermentation; froth; spume; scum; as, the foam of the sea.
2. To cause to foam; as, to foam the goblet; also ( with out), to throw out with rage or violence, as foam.
3. To form foam, or become filled with foam; - said of a steam boiler when the water is unduly agitated and frothy, as because of chemical action.
4. To gather foam; to froth; as, the billows foam.

Synonyms:

suds, fume, scintillate, yeast, solid, feelings, spume, spark, explode, coruscate, bristle, anger, boil over, form bubbles, head, rage, burn, steam, blow up, sparkle, seethe, flare up, cream

bubble (part of speech: verb)

boil, lather, effervescence, bubble, cloud, aerate, spray, balloon, froth, effervesce, fizz, surf

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