1894 Brewer’s / I / Incog.—i.e. Incognito (Italian)
Under an assumed name or title. When a royal person travels, and does not wish to be treated with royal ceremony, he assumes some inferior title for the nonce, and travels incog.
· ·
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.