1883. Punch, June 2, p. 264, col. 1. The average number of chucks
at cocoa-nuts before achieving success is six.
5. (nautical).—Sea biscuit. Cf., senses 1 and 6. A sailor’s variant is
‘chow-dow.’
1864. Standard, 13 Dec. Of naval slang Mr. Hotten has missed the
words chuck, used by sailors for biscuit, and barge, the box or
cask in which the chuck is kept by the messes on the lower deck.