Longman Dictionary of Contemporary English homepage

froth

2 verb
     
Related topics: Drink
froth2 [intransitive]
1 also froth upDFDHC if a liquid froths, it produces or contains a lot of small bubbles on top:
When you first open the bottle the beer will froth for a few seconds.
2HBH if someone's mouth froths, saliva comes out as small white bubbles
3

froth at the mouth

a) HBH to have saliva coming out of your mouth as small white bubbles
b) informal to be extremely angry

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