As a Verb or Adjective:
1. To totally finish doing, making, or producing something. English = complete, completely finish.
2. To be totally finished with no more work to do or parts to add. English = (be) completed, (be) completely finished.
As Modifier:
1. Used before or after a verb (action) sign to mean the action has happened before the present time, and therefore does not need to happen again, or has happened earlier than you expected. English = already.
Note:
1. This sign is often made with just one hand.