n. & v.
n. 1 a a collection of small bubbles in liquid, caused by shaking, fermenting, etc.; foam. b impure matter on liquid, scum. 2 a idle talk or ideas. b anything unsubstantial or of little worth.
v. 1 intr. emit or gather froth (frothing at the mouth). 2 tr. cause (beer etc.) to foam. froth-blower Brit. joc. a beer-drinker (esp. as a designation of a member of a charitable organization). frothily adv. frothiness n. frothy adj. (frothier, frothiest).
[ ME f. ON frotha, frauth f. Gmc ]