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blackboard jungle

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noun Informal.
  1. a school or school system characterized by lack of discipline and by juvenile delinquency.
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Origin of blackboard jungle

1950–55; on the model of asphalt jungle; popularized by the novel of the same name (1954) by American author Evan Hunter (born 1926)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018