At or near the door; positioned at a doorway or entrance.
Middle English compound: 'a-' (at) + 'doors' (plural of door, used as a location). The 'a-' prefix originally meant 'at' and appears in archaic phrases like 'afoot' (at foot) and 'abed' (at bed).
Words like 'adoors' show how English used to add 'a-' in front of nouns to mean 'in that location'—you don't hear it anymore except in Shakespeare and fantasy novels, which is why it sounds so dramatically archaic!
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