A stone threshold or stone at the entrance of a door; the flat stone or slab that forms the base of a doorway.
From 'door' + 'stone' (from Old English 'stan' meaning rock or stone, from Proto-Germanic 'stainaz'). This describes the literal stone foundation of a doorway.
Medieval doorstones were carved with family crests and dates—some historic homes have doorstones 500+ years old with names and symbols that literally introduce you to the family before you even knock, making them ancient business cards in stone!
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