Paralipsis is a kind of irony in which the speaker proposes not to speak of a matter, but still somehow reveals it.
I know who did it, but I won’t mention Bill’s name.
Gove, Philip B. (editor). 1966.Webster's third new international dictionary of the English language. Unabridged, with seven language dictionary. Chicago: Encyclopaedia Britannica.
Corbett, Edward P. J. 1971.Classical rhetoric for the modern student. New York: Oxford University.