foam

US /foʊm/

UK /fəʊm/

B1
n. (c./u.)Noun (Countable/Uncountable)Mix of a liquid and air to form a mass of bubbles
You should wash your hands with soap until it produces a thick foam
v.t./i.Verb (Transitive/Intransitive)To mix air and liquid to form a mass of bubbles
The soap will foam up when it is mixed with water
n. (c./u.)Noun (Countable/Uncountable)A lightweight material made of a mass of small bubbles, used for insulation or padding.
This mattress is made of memory foam.
v.t./i.Verb (Transitive/Intransitive)To show anger or excitement in an uncontrolled way.
He was foaming at the mouth with rage.

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