Green’s Dictionary of Slang

smack and tumble v.

[rhy. sl. = rumble v.2 (1), but note tumble to under tumble v.2 ]

(UK und.) to discover, to find out.

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[UK]Thieves Slang ms list from District Police Training Centre, Ryton-on-Dunsmore, Warwicks 10: Smack and tumble: Find out.