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loony bin

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noun Informal.
  1. an insane asylum or the psychiatric ward of a hospital.
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Origin of loony bin

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for loony bin

loony bin

noun
  1. slang a mental hospital or asylum
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012