[jak-leg] Chiefly South Midland and Southern U.S.
unskilled or untrained for one's work; amateur: a jackleg electrician.
unscrupulous or without the accepted standards of one's profession: a jackleg lawyer.
makeshift; temporary.
an unskilled or unscrupulous itinerant worker or practitioner.

1840–50, Americanism; perhaps jack1 + (black)leg

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The cables are fitted with special heads so they can be inserted by either a jackleg drill or a roof bolter.
Other mining-related activities are jackleg drilling, spike driving, and hand mucking contests.
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