As a Noun: 1. Small balls of air that form in a liquid and then rise to the surface, either because it is very hot and boiling or because it is fizzy. English = bubbles. As a Verb or Adjective: 1. Of a hot liquid, to start to change into steam and vapour as bubbles appear in it. English = boil. 2. Of a liquid, to have small balls of air forming in it and then rising to the surface. English = bubble, (be) bubbling, (be) bubbly, (be) effervescent. 3. To be extremely angry. Idiomatic English = (be) fuming; fume.