To be, by chance, in the same physical place at the same time, as a result of two completely separate journeys.(verb)
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Use "cross paths" in a sentence
"Mary Jo and I will cross paths until Jack is a grown-up, and even then we will undoubtedly see each other at some of the milestone events in his life."
"Ordinarily, Nicci would have been only too happy to cross paths with the woman, but not now."
"In her years with the National Park Service Anna had only had occasion to cross paths with the Earthwatch organization once before."