Question 1

What does "foam up" mean?

Accepted Answer

Of a liquid or substance, to produce a large amount of foam or bubbles.

Question 2

How do you use "foam up" in a sentence?

Accepted Answer

The drain cleaner foamed up violently when it came into contact with the blockage.

Question 3

Is "foam up" formal or informal?

Accepted Answer

"foam up" is register-neutral — appropriate in both casual and formal contexts. Used for liquids, cleaning products, beer, soap, or any substance that produces foam when agitated or mixed. Can be intransitive ('the water foamed up') or transitive ('the barista foamed up the milk'). Also used in informal speech to describe someone becoming very agitated or angry ('foamed up with rage'), though this is rare.

foam up

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