to go from one place or side to another, especially across a border or area; (of a spirit) to pass from the world of the dead into the world of the living
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to go from one place or side to another, especially across a border or area
meet the army, step into an automobile and cross over into Osterlich.
...was Caesar able to cross over to Italy and come home at last...
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(of a spirit) to pass from the world of the dead into the world of the living
We've put their photos on the ofrenda so their spirits can cross over.
Definitions from the Oxford Advanced Learner's Dictionary, 9th edition