Chiefly South Midland and Southern U.S.| 1. | unskilled or untrained for one's work; amateur: a jackleg electrician. |
| 2. | unscrupulous or without the accepted standards of one's profession: a jackleg lawyer. |
| 3. | makeshift; temporary. |
| 4. | an unskilled or unscrupulous itinerant worker or practitioner. |