foam at the mouth

verb foams at the mouth · foaming at the mouth · 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.
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.