That si the correct spellling of "dumbwaiter" (a small
elevator)
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A dumbwaiter!
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the proper term is "dumbwaiter". dumbwaiter is a small elevator
used to send food from kitchen to another area of house.
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In this case "Dumb" means not speaking. Instead of a human
waiter bringing food from the kitchen to the serving area, a small
hand operated elevator- the dumbwaiter- brought the food.
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Dumbwaiter
-A dumbwaiter is small elevator used to convey food or other goods from one floor of a building to another.
it is also the portable serving stand or table placed near the guest to serve the food
It is called a dumbwaiter because it is an inanimate object that is essentially aiding the worker in serving the food.