"A `bucker' is a vicious horse, to be found only in Australia."

1884. `Harper's Magazine,' July, No. 301, p. 1 (`O.E.D.'):

"If we should . . . select a `bucker,' the probabilities are that we will come to grief."

1893. Haddon Chambers, `Thumbnail Sketches of Australian Life,' p. 64:

"No buck jumper could shake him off."

1893. Ibid. p. 187:

"`Were you ever on a buck-jumper?' I was asked by a friend, shortly after my return from Australia."

<hw>Buck-jumping</hw>, <hw>Bucking</hw>, <i>verbal nouns</i>.

1855. W. Howitt, `Two Years in Victoria,' vol. i. p. 43:

"At length it shook off all its holders, and made one of those extraordinary vaults that they call <i>buck-jumping</i>."