Meaning ofbackseat driverin English

Noun

1. someone offering unsolicited advice on a situation
   My friend is such a backseat driver, always telling me how to drive.
2. a person habitually interfering with decisions (from a secondary position)
   The new employee was being a backseat driver, trying to control the project from the side.
3. a passenger in a vehicle giving unwanted directions
   My brother is a backseat driver, constantly giving me directions while I'm driving.