- a small, portable stand for serving food, often with shelves
- a small elevator for sending food, trash, etc. from one floor to another
- A small elevator used to convey food or other goods from one floor of a building to another.
- A portable serving stand or table.
From dumb ("unable to speak") + waiter, originally separate words and describing the portable table's inability to relate gossip after the meal. By the use of the term to describe small service elevators in American homes in the 1840s, it simply meant dumb as "mechanical", "unable to speak at all".