More about the door

Why did men worship in churches, locking themselves away in the dark, when the world lay beyond its doors in all its real glory?

Charles de Lint

A door is what a dog is perpetually on the wrong side of. [Ogden Nash]

You can see the dictionary here
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Door (n.)
Middle English merger of Old English dor (neuter; plural doru) “large door, gate,” and Old English duru (fem., plural dura) “door, gate, wicket;” both from Proto-Germanic *dur- (cf. Old Saxon duru, Old Norse dyrr, Danish dør, Old Frisian dure, Old High German turi, German Tür).The Germanic words are from PIE *dhwer- “a doorway, a door, a gate” (cf. Greek thura, Latin foris, Gaulish doro “mouth,” Gothic dauro “gate,” Sanskrit dvárah “door, gate,” Old Persian duvara- “door,” Old Prussian dwaris “gate,” Russian dver’ “a door”).The base form is frequently in dual or plural, leading to speculation that houses of the original Indo-Europeans had doors with two swinging halves. Middle English had both dure and dor; form dore predominated by 16c., but was supplanted by door.