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.