noun
a person or animal producing foam or froth from their mouth, typically due to being highly agitated or rabid
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The rabid dog was foaming at the mouth, a common symptom of the disease.
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When he heard the news, he was so angry he was practically foaming at the mouth.
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The referee was so mad, he was foaming at the mouth over that call.
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The politician's speech had the audience foaming at the mouth with excitement.