froth

1. N-UNCOUNT Froth is a mass of small bubbles on the surface of a liquid. (液體表面的) 泡沫

...the froth of bubbles on the top of a glass of beer. …一杯啤酒頂上的泡沫。

2. V-I If a liquid froths, small bubbles appear on its surface. 起泡沫

The sea froths over my feet. 海水在我腳上泛起泡沫。