a small cupboard or closet.
A pony that works in a mine.
A coalfish (Pollachius virens).
A lever mounted on a tripod for lifting stones, leveling up railroad ties, etc..
A donkey, especially one driven by a huckster or greengrocer.
A cabin, for the use of the captain, in the after part of a sailing ship under the poop deck.
"Stupid person," by 1951, American English, from dumb. The Disney musical cartoon is from 1941; in it the elephant's name is a mocking nickname based on Jumbo.
A stupid person.