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

Their lungs produce more mucus which can make them cough and foam at the mouth.

From The Guardian • Mar. 8, 2018

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

From US News • Aug. 17, 2016

Presently the beast uttered a long and melancholy howl which thrilled me through, for I knew it to be Masapo's death warrant, then began to scratch the ground and foam at the mouth.

From Child of Storm by Haggard, Henry Rider