01 n. The plank, stone, or piece of timber, which lies under a door, especially of a dwelling house, church, temple, or the like; the doorsill; h…
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1.
The plank, stone, or piece of timber, which lies under a door, especially of a dwelling house, church, temple, or the like; the doorsill; hence, entrance; gate; door.
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2.
Fig.: The place or point of entering or beginning, entrance; outset; as, the threshold of life.