froth up
Obere Mittelstufe (B2) neutral
When a liquid makes lots of little bubbles and gets foamy, like milk when you steam it for a coffee.
"Froth up the milk with the steamer before pouring it into the espresso."
When a liquid makes lots of little bubbles and gets foamy, like milk when you steam it for a coffee.
"Froth up the milk with the steamer before pouring it into the espresso."