hole in the wall
n.— «Mr Hopwood likens the machines to the banks’ automatic teller machines. “Who would want to go back to the days of having to queue in the bank during the limited hours they are open, when you can get cash immediately from the hole in the wall?” he asks.» —“Plastic Money, Instant Films” by David Frith Sydney Morning Herald (Australia) Jan. 30, 1989. (source: Double-Tongued Dictionary)
Further reading
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