As a Noun: 1. A situation in which lots of things are happening or being done. English = activity, action. 2. Something that you do on a particular occasion. English = action. 3. All the important and exciting things that happen in a situation, especially in a film. English = action. As a Verb or Adjective: 1. To be working hard or concentrating on a task, so that you are not free to do anything else. English = (be) busy.