E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A giant in the tale of Tom Thumb. A raven picked up Tom, thinking him to be a grain of corn, and dropped him on the flat roof of the giants castle. Old Grumbo came to walk on the roof terrace, and Tom crept up his sleeve. The giant, annoyed, shook his sleeve, and Tom fell into the sea, where a fish swallowed him, and the fish, having been caught and brought to Arthurs table, was the means of introducing Tom to the British king, by whom he was knighted. (Nursery Tale: Tom Thumb.)