foam

noun

/fəʊm/

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(also foam rubber)
[uncountable] a soft light rubber material, full of small holes, that is used for seats, mattresses, etc.
- a foam mattress
- foam packaging
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[uncountable] a mass of very small air bubbles on the surface of a liquid synonym froth
- a glass of beer with a good head of foam
- The breaking waves left the beach covered with foam.
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[uncountable, countable] a chemical substance that forms or produces a soft mass of very small bubbles, used for washing, shaving (= cutting hair from the skin), or putting out fires, for example
- a bottle of bath foam
- The fire extinguisher directs foam onto the fire.
see also shaving foam

Word OriginOld English fām (noun), fǣman (verb), of West Germanic origin; related to Old High German feim (noun), feimen (verb).

verb

/fəʊm/

[intransitive]

Verb Forms

present simple I / you / we / they foam	/fəʊm/ /fəʊm/
he / she / it foams	/fəʊmz/ /fəʊmz/
past simple foamed	/fəʊmd/ /fəʊmd/
past participle foamed	/fəʊmd/ /fəʊmd/
-ing form foaming	/ˈfəʊmɪŋ/ /ˈfəʊmɪŋ/

Idioms

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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
Word OriginOld English fām (noun), fǣman (verb), of West Germanic origin; related to Old High German feim (noun), feimen (verb).

Idioms

foam at the mouth

(especially of an animal) to have a mass of small bubbles in and around its mouth, especially because it is sick or angry
- The dog started foaming at the mouth.
(informal) (of a person) to be very angryTopics Feelingsc2