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Definition of foam verb from the Oxford Advanced American Dictionary

 

foam

 verb
verb
NAmE//foʊm//
 
[intransitive]Verb Forms present simple I / you / we / they foam
 
 he / she / it foams
 
 past simple foamed
 
 -ing form foaming
 
 
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  • (of a liquid) to have or produce a mass of small bubbles synonym froth She looked down at the foaming white water. The toothpaste foamed in his mouth. tankards of foaming beer
    • Idioms
      foam at the mouth
       
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    1. 1(especially of an animal) to have a mass of small bubbles in and around its mouth, especially because it is sick or angry
    2. 2(informal) (of a person) to be very angry
    See foam in the Oxford Advanced Learner's Dictionary
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