from the GNU version of the Collaborative International Dictionary of English
- interj. An expression equivalent to What did you say? Sir? Eh?
from The Century Dictionary and Cyclopedia
- At once; immediately; anon.
- An interrogative particle signifying that one has not heard or comprehended what has been said.
- [In this sense formerly, and still dialectally, much used in replying to questions or commands, to gain a slight delay, though originally implying “I will attend to you at once”; hence, with an interrogative tone, it came to imply that the question or command was not understood. It is the same word as anon.]
Sorry, no etymologies found.