in the back meaning

[American slang]
in the back part of a building; in the back room of a building.
  I don't have your size here, but perhaps I can find it in the back.
  He's not in the shop right now. I'll see if he's in the back.

• back:    Adverb: back  ...
• back at it:    [American slang]do ...
• back of:     (US)  B ...

Examples

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1. i can't let them get in the back seat.
2. during the fight he was knifed in the back.
3. he had put up a basket on a pole in the back yard.
4. he sat in the back seat and soon felt very sleepy.
5. danny was in the back of the post office, sorting packages.