Covered with or having produced froth (bubbles or foam); agitated or excited, especially used to describe an angry person.
Past tense of 'froth,' from Old Norse 'froða.' Often used to describe foam on waves or the frothy saliva of an excited animal.
The image of someone 'frothed' at the mouth comes from real disease symptoms—rabies and some seizures do cause foam to appear, which is why ancient people found it so terrifying and dramatic.
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