off center meaning

[American slang]
not exactly in the center or middle.
  The arrow hit the target a little off center.
  The picture hanging over the chair is a little off center.

Examples

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1. any hole must not be off center by more than 1 / 32
2. off center running of the belt conveyer and countermeasures for it
3. although london is britain's capital it is located off center
4. ocpl off center parting line
5. mary hung the picture off center because it was more interesting that way