Green’s Dictionary of Slang

Harry Holt n.

[rhy. sl = bolt n.1 (1)]

(Aus. prison) an escape.

[Aus]Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Harry Holt. Escape. Rhyming slang for ‘bolt’. Sometimes just Harry or ‘to visit Uncle Harry’. Holt was a former Australian Prime Minister who did in fact disappear without trace.