Green’s Dictionary of Slang

1. (UK Und.) to steal.

1937–84

Partridge DSUE (1984) 49/1: C.19–20.

2. (UK Und.) to hide away in a safe place.

1864, 1867, 1870		Hotten Sl. Dict.
1873		Sl. Dict.
1882		Sydney Sl. Dict. (2 edn) 1: Bank - To put in a place of safety. Also to go shares.
2014-20		T. Thorne (ed.) ‘Drill Slang Glossary’ at Forensic Linguistic Databank 🌐 banked – safely stored, in reserve.
2021		Central Cee ‘6 for 6’ 🎵 [of hiding cling-filmed drugs in the anus] That kid got nicked on an amateur ting / Gotta bank that cling, take precaution.

3. (UK Und.) to go fair shares.

1873

Sl. Dict.

4. (US gambling) to run a numbers lottery.

1954

W.G. Smith South Street 45: ‘You’re all right, man. Cover that area like a blanket! Be banking it soon, I don’t watch out’.