1 [singular, uncountable]DFDHC
a mass of small bubbles on the top of a liquid [= foam]:
'Excellent beer,' he said, wiping the froth from his mouth.
2 [singular, uncountable]
small white bubbles of saliva around a person's or animal's mouth
talk or ideas that are attractive but have no real value or meaning:
The book has too much froth and not enough fact.