What does "cross paths" mean?| Vocabulary

cross paths   /ˈkrɑːs ˈpæðz/   idiom

When people cross paths or when their paths cross, they meet each other at a time that was not planned or expected.
	After they left college, it was many years before they crossed paths again. = It was many years before their paths crossed again.
	I crossed paths with an old friend on a business trip.