1898 Fishing Gaz. 23 July 86/1 How do we see nine-tenths of jackers commence operations: Their rods may be all right..their running line is thickly enamelled, and is strong enough almost to haul out a tarpon.

1901 Rep. Industr. Comm. 14 306 The jacker is a man who works between the laster and the second laster.

1926 Amer. Speech 2 87/1 The old hardrock miners..were either single jackers or double jackers.

1947 Forest & Bird 155 15 The men operating the jacks, called jackers, became very expert, and on level ground could keep a log continually on the move.

1860 Morning Chron. 12 Sept. ‘Winders’, ‘doublers’, ‘threaders’, and ‘jackers-off’.

1924 J. Marchant Dr. John Clifford i. 5 Three-fourths of the children were jackers-off or ‘piecers’.

1942 in G. Legman Limerick (1953) 258 A young jacker-off of Cawnpore Never felt a desire for more.

2000 J. Edwards & A. Stephens Coming Clean xix. 135 The self-stimulatory act of the jacker-off is supposed to be unnecessary if he has a willing counterpart.

1911 Crow Bar (Minneapolis) Sept. 25/2 The car is brought back to its usual level without mishap, and jacker up proceeds to devise a more stable method.

1921 Dict. Occup. Terms (1927) §688 Jacker-up (lead pencil making); places a number of glued pencils together in a clamp, and screws down clamp to make glueing secure; removes pencils when clamping is complete.

1923 N.Y. Times 17 Nov. 12/2 As ‘the business agent of California products’, which no American ought to consume without gratitude to that thoughtful jacker-up of prices, he lost the odor of progressive sanctity.

1982 Listener 13 May 22/1 Robert Ponsonby..ought to have known better than to propose this writer as a suitable jacker-up of the new Prom season.