foaming at the mouth

Verb

foam at the mouth (third-person singular simple present foams at the mouth, present participle foaming at the mouth, simple past and past participle foamed at the mouth)

1. To spew saliva as foam.
   • The servant, who had not stayed long enough to have crossed the court to Conrad’s apartment, came running back breathless, in a frantic manner, his eyes staring, and foaming at the mouth.1764, Horace Walpole, chapter I, in The Castle of Otranto

   Synonyms:

   froth at the mouth

2. (figuratively) To rage, vent one's anger.
   • My lord,
     Now fear is from me, I'll speak troth. Lord Cloten,
     Upon my lady’s missing, came to me
     With his sword drawn; foam’d at the mouth, and swore,
     If I discover’d not which way she was gone,
     It was my instant death.1611 April (first recorded performance), William Shakespeare, “The Tragedie of Cymbeline”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard...