The Kid made straight for the box stall and told Silver hello over the half door.
Some horses are fond of looking through a window or over a half door.
He kicked open the top of the half door, and pointed to the clear sky.
Instead of cutting the man down he went himself and opened the half door at the top.
Miss Burgoyne and her donkey were thrusting their heads in at the half door.
Ann Holland quickly guessed there was something important to be told, and she opened the half door to her neighbor.
Dalton now unbarred the half door and stalked in, as if he would carry the place by storm.
The recumbent figure, in passing, lay hardly as high as the half door.
Madame De Ber was leaning over her half door, and gave a cry of joy.
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.
A door is what a dog is perpetually on the wrong side of. [Ogden Nash]