Brewer's: Sea-green Incorruptible
(The). So Carlyle called Robespierre in his French Revolution.
“The song is a short one, and may perhaps serve to qualify our judgment of the `sea-green incorruptible.' ” —Notes and Queries, September 19th, 1891, p. 226.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894