jackleg

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jack·leg

 (jăk′lĕg′) Chiefly Southern & South Midland US
adj.
1. Lacking skill or training; incompetent. Used especially of lawyers or preachers.
2. Unscrupulous or dishonest.
3. Makeshift; temporary.
n.
1. An unskilled or unscrupulous itinerant worker.
2. A strikebreaker.

[Perhaps jack + (black)leg.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

jackleg

(ˈdʒæklɛɡ)
adj
amateur; untrained; incompetent
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

jack•leg

(ˈdʒækˌlɛg)
Chiefly South Midland and Southern U.S. adj.
1. unskilled or untrained; amateur.
2. lacking professional scruples; unethical.
3. makeshift; temporary.
n.
4. an unskilled or unscrupulous itinerant worker or practitioner.
[1840–50]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in classic literature ?
He has been told many a time how the born- and-trained novelist works; won't he let me round and complete his knowledge by telling him how the jackleg does it?
Built-in leveling indicators allow operators to position the stacker regardless of the ground evenness, with independent hydraulic jacklegs to stabilize once in place.
The Triune Democrat, a fiercely Democratic paper in Donaldsonville, attacked Marks as a conniving carpetbagger unqualified for the position of judge: "with the advent of carpet baggism the crop of jacklegs and interlopers has sprung up in the legal profession as well as in the other walks of life, and so we come to have the spectacle of a Morris Marks teaching the sons of Louisiana how to practice law without a diploma." While the fact that Marks was a foreign-born Jew was unmentioned in this attack, the editorial makes a distinction between the Republican and "sons of Louisiana," portraying Marks as an outsider.
Launched this past June, the Trade Floor is described as an online liquidation and acquisition marketplace where everything from drills and jacklegs to spare parts for air compressors, is on the auction block.
Make Your Color Linger Jacklegs no-fail secret for making lipstick last?
Because of the weight of the scissor lift and body, as well as ancillary equipment such as the stabilising jacklegs, the payload on these 26-tonne gvw chassis is as low as four tonnes-but this is still more than enough to fulfill the task for which they are designed.
Selectivity is paramount and so low-tonnage mining equipment including jacklegs and slushers are used in narrow stopes, though drill jumbos and Atlas Copco Wagner LHDs are used in the wider areas.
"My impression is that they're a bunch of jacklegs that come up from Texas and Mississippi." (A jackleg, he explains patiently, is" someone who says he can do anything, but can't do nothing.")
put the S250-M3 and three other leading jacklegs head-to-head.