The Cornish giant who fell into a pit twenty feet deep, dug by Jack the Giant-killer, and filmed over with grass and gravel. The name means cormorant or great eater. For this doughty achievement Jack received a belt from King Arthur, with this inscription-
This is the valiant Cornish man That slew the giant Cormoran.
Jack the Giant-killer.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894