foam at the mouth Definition

foam
noun

1. A mass of tiny bubbles forming on the surface of liquids.

Thesaurus: froth, bubbles, head, lather, frothiness, suds, effervescence, spume.
2. A substance composed of tiny bubbles formed by passing gas through it.
3. Frothy saliva or perspiration.
4. Any of many light cellular materials used for packaging, insulation, etc, produced by passing gas through, and then solidifying, a liquid.
5. A colloid consisting of gas bubbles dispersed evenly throughout a liquid.

Example: shaving foam
6. poetic
The sea.
7. Also as adj.

Example: foam rubber

verb

tr & intr
foamed, foaming
1. To produce or make something produce foam.

Form: foam up (sometimes)

Derivative: foaming
noun, adj

Derivative: foamless
adj

Idiom: foam at the mouth

colloq
To be furiously angry.

To produce and expel frothy saliva at the mouth, eg as a rabid animal does.

Etymology: Anglo-Saxon fam.