Keywords: back, background, backwards, back up, reverse
As a Noun
The side or part of something that is towards the rear or farthest from the front. It is normally not used or seen as much as the front. English = back.
The kind of family you come from and the kind of education you have had. English = background.
As a Verb or Adjective
To be located at the side or part of something that is towards the rear or farthest from the front. English = at the back of.
To move in a direction which is the opposite direction to the one in which you normally face or in which you normally go. English = go backwards, back up, reverse.
To move in a direction that takes you to a place where you were before. English = go back.
As a Pointing Sign
Also used just like an index finger pointing sign when you are pointing to something which is either behind you or is located somewhere but you do not know or care where that is.