foam at the mouth

Idioms  

1. Be extremely angry, as in She was foaming at the mouth over the judge's ruling. This hyperbolic term uses the verb foam in the sense of “froth at the mouth,” a usage generally applied to animals such as horses and dating from about a.d. 950. [1400s]

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Example Sentences

Not all animals with rabies will foam at the mouth, though some will if the disease is in a more advanced stage.

From Seattle Times • Sep. 29, 2021

They’ll foam at the mouth for the barky sound of the Manchester post-punk band.

From Washington Post • Jul. 15, 2021

Well, it’s his party and he can foam at the mouth if he wants to.

From US News • Aug. 17, 2016

I always wondered what he’d put in his mouth so he could foam at the mouth, like an Alka Seltzer or something.

From Time • Jun. 13, 2013

Can I help it if those accursed beasts choose to eat dead locusts instead of grass, and foam at the mouth and choke?

From The Ghost Kings by Haggard, Henry Rider