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Gochugogi has it right.
Focus shift is what happens when the lens stops down during the taking of the photo. With a very few lenses, when the lens is focused wide open, the plane of focus will shift when it gets stopped down to f/4 say. It "goes away" by f/8 and beyond whether or not it has de-shifted or is still shifting; at those f/stops the depth of field is large enough to mask a focus shift effect.
Focus shift moves the scene plane of focus forward or back while maintaining the same orientation to the optical axis, i.e. perpendicular. The plane of focus does not tilt.
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