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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There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...