What is the meaning of the word "kibble"?

Definitions:

  1. an iron bucket used for hoisting in wells or mining copy to clipboard noun
    • The miners came down into the mine in a kibble. copy to clipboard
  2. coarsely ground grain or meal, often pelletized, as for animal food copy to clipboard noun
    • I feed my pets kibble and gravy. copy to clipboard
  3. to grind coarsely copy to clipboard verb
    • The machine kibbles the oats to make it cook faster. copy to clipboard