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to foam at the mouth
01
to become extremely furious about something
![to [foam|froth] at the mouth definition and meaning](https://cdn.langeek.co/photo/60628/original/angry?type=jpeg "to [foam|froth] at the mouth definition and meaning")
What is the origin of the idiom "foam at the mouth" and when to use it?
The phrase "foam at the mouth" has its origins in the physical symptom associated with rabies, a viral disease that affects mammals. When an animal such as a dog contracts rabies, the virus affects the central nervous system, leading to erratic behavior. This idiom is commonly used in discussions of heated arguments, intense confrontations, or instances of extreme frustration.
Examples
Every time he hears that song, he foams at the mouth and goes on a rant about how much he despises it.
She froths at the mouth whenever someone challenges her opinions, unable to handle differing viewpoints.
02
*** (especially of an animal) to have a mass of small bubbles in and around its mouth, especially because it is sick or angry
