One of the mysteries of the English language finally explained.
1Chiefly Australian. A former convict, especially one who was transported or sentenced to penal servitude.
2A hardened or habitual prisoner; a recidivist. In extended use: = "old hand".
Early 19th century; earliest use found in James Vaux (1782–c1841). From old + lag.
old lag/ˌəʊl(d) ˈlaɡ/
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