come by phrasal verb ( see also ↑ come )
1 . come by something to manage to get something that is rare or difficult to get:
How did you come by these pictures?
Jobs were hard to come by.
2 . come by (something) to make a short visit to a place on your way to somewhere else:
He said he’d come by later.
I’ll come by the house and get my stuff later, OK?