Meaning

noun a mass of small bubbles formed in or on a liquid

verb become bubbly or frothy or foaming

verb make froth or foam and become bubbly

originFrom Middle English froth, frooth, froþ, likely a borrowing from Old Norse froða, from Proto-Germanic *fruþǭ; Old English āfrēoþan (“to foam, froth”) is from same Germanic root. Verb attested from late 14th century. Compare Swedish fradga.

Etymology from Wiktionary, CC BY-SA 3.0