come by

Dorothy did not know what to say to this, for all the people seemed to think her a witch, and she knew very well she was only an ordinary little girl who had come by the chance of a cyclone into a strange land.

But how did he come by his death?

how does he come by his name—his fortune?

Many modern devices are glued rather than screwed together, spare parts can be hard to come by, and a new appliance often costs less than having the old one repaired.