An outside step leading up to the door of a building, usually a home.
On one's doorstep.
One's immediate neighbourhood or locality.
They want to build the prison right on our doorstep; it will only be half a mile away and being that close scares me.
A big slice, especially of bread.
To visit one household after another to solicit sales, charitable donations, political support, etc.
To corner somebody for an unexpected interview.