A doorstep is the flat stone, concrete, or wooden platform at the bottom of a doorway, right where you step when entering or leaving a building. It's that threshold piece you cross every time you walk through a door to the outside.

Doorsteps serve a practical purpose: they help keep rain, snow, and dirt from flowing directly into the house, and they make the transition from ground level to floor level easier. In many homes, the doorstep is where you might find packages delivered, where you wipe your shoes before coming inside, or where you sit on a summer evening watching the neighborhood.

The word also appears in expressions that mean “very close” or “right at hand.” When opportunity appears on your doorstep, it means you don't have to go searching for it because it has come directly to you. If a new library opens on your doorstep, it's so close to your home that you can practically walk there in your slippers. When someone says a problem has arrived at their doorstep, they mean it has become immediate and unavoidable, no longer something distant they can ignore.