TWO SHAKES OF A LAMB?S TAIL ? "One who has seen a lamb shake its tail, sees readily that this saying means with no loss of time, for a lamb can shake its tail twice 'before one can say Jack Robinson.' Usage appears to be entirely American, going back a hundred years or longer. (Note publication date of Mr. Funk's book.) The probabilities are that the saying is a humorous enlargement of the older 'in a couple of (or brace of, or two) shakes,' a saying first record by Richard Barham in 'Ingoldsby Legends' in 1840, but probably much older. This latter saying has been variously interpreted as alluding to a double shake of the hand, two shakes of a dice box, two shakes of a dustcloth, or whatever it may be that takes little more time in shaking twice than in shaking once." From "A Hog on Ice" by Charles Earle Funk (Harper & Row, New York, 1948).
