Translation guide
Describes the state of producing or being covered in foam, such as soap suds, beer head, or sea foam. Japanese uses different words depending on the substance and context.
Describing a liquid that is producing or covered in foam, like soapy water or a freshly poured beer.
Verb meaning 'to foam' or 'to froth'. Used for liquids that naturally form bubbles, like soap, beer, or waves.
The beer is foaming.
The soap foams well.
Phrase meaning 'foam forms' or 'bubbles rise'. Often used descriptively.
When I added detergent, it foamed up.
Technical term for 'foaming' or 'effervescing', used in chemistry or manufacturing contexts.
This liquid foams when heated.
Describing foam coming from the mouth, often due to a medical condition or extreme anger.
Idiomatic phrase meaning 'to foam at the mouth'. Used for both literal (e.g., seizure) and figurative (e.g., rage) contexts.
He foamed at the mouth during the seizure.
He was so angry he was practically foaming at the mouth.
More literal description: 'to produce foam from the mouth'. Less idiomatic but clear.
Describing sea foam or waves that are frothy.
Specifically referring to the symptom of rabies.
Same phrase as above, but in the context of rabies. Often appears in older literature.
A dog with rabies foams at the mouth.
泡立つ is a single verb, while 泡が立つ is a phrase with the noun 泡 (foam) and verb 立つ (to rise). Both are natural, but 泡立つ is more concise and common in everyday speech.
For carbonated drinks like soda, use 炭酸が強い (strongly carbonated) or シュワシュワする (fizzy onomatopoeia). 泡立つ is for foam, not fizz.
The dog was foaming at the mouth.
White, foaming waves were rising offshore.