doorsill

"That's the program," replied the leading boy; and with these words he immediately crossed the doorsill.

Five minutes later he stumbled across his own doorsill, calling his wife's name.

Its doorsill lay even with the pavement, inviting custom by an easy access, while repelling it by its squalor.

There is a movable doorsill, out of which a small hole is often cut to admit of entrance and exit for the dogs and cats.