Etymology
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doorstep (n.)

also door-step, "threshold, step up from the ground to a door," 1810, from door + step (n.).

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Definitions of doorstep

doorstep (n.)
the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway;
Synonyms: doorsill / threshold
From wordnet.princeton.edu