Meaning of the word "foam at the mouth" in English

What does "foam at the mouth" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

foam at the mouth

US /foʊm æt ðə maʊθ/
UK /fəʊm æt ðə maʊθ/
"foam at the mouth" picture

Idiom

to be extremely angry about something

Example:
He was foaming at the mouth when he heard about the betrayal.
The manager was foaming at the mouth after the team lost the crucial game.