What does 'over' mean?
Let's come [or 'walk'] back on the next street over.
Here 'over' suggests 'displaced on the coordinate system of streets', so the full meaning of 'to come back on the next street over' is to come back on the closest street that is parallel to the street you are on (but in the opposite direction of course). [ In most cities there would be two streets that satisfy the description 'next street over', so without a hand signal from the speaker to say which of the two, you wouldn't know exactly which street was intended. ] CJ
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Here 'over' suggests 'displaced on the coordinate system of streets', so the full meaning of 'to come back on the next street over' is to come back on the closest street that is parallel to the street you are on (but in the opposite direction of course).
[ In most cities there would be two streets that satisfy the description 'next street over', so without a hand signal from the speaker