E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Done like a Frenchman, turn and turn again (1 Henry VI., iii. 4). The French are usually satirised by mediæval English authors as a fickle, wavering nation. Dr. Johnson says he once read a treatise the object of which was to show that a weathercock is a satire on the word Gallus (a Gaul or cock).
Frenchman. The nickname of a Frenchman is Crapaud (q.v.), Johnny or Jean, Mossoo, Robert Macaire (q.v.); but of a Parisian Grenouille (Frog). (See BRISSOTINS.)