WordReference Random House Learner's Dictionary of American English © 2026
ˈloon•y ˌbin, n. [countable] [Informal.]
  1. Informal Termsan insane asylum.

WordReference Random House Unabridged Dictionary of American English © 2026
loon′y bin′, [Informal.]
  1. Informal Termsan insane asylum or the psychiatric ward of a hospital.
  • 1880–85

Collins Concise English Dictionary © HarperCollins Publishers::
loony bin n
  1. offensive slang a psychiatric hospital
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