General Definition: 1. Of anything that has some length, to become shorter starting from one end and moving towards the other end, or any thing or action associated with this, such as a progress bar or a power gauge. As a Noun: 1. An indicator on a computer’s screen to show that a task is underway and how much of it is completed. English = progress bar, status bar. As a Verb or Adjective: 1. Of petrol in a vehicle, to become used up so that there is no more left; to run out of petrol. 2. Of a progress or status bar on a computer, to change size showing that the task is progressing or how much of it has been completed.