Green’s Dictionary of Slang

arthur n.

[rhy. sl. J. Arthur Rank; ult. f. J. Arthur, later Lord Rank (1888–1972), the British flour producer turned film magnate who dominated the British film business during the 1930s–40s]

a bank.

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[UK]D. Powis Signs of Crime 172: Arthur (Rank) Bank; see also J. Arthur.