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no-knock

[noh-nok]
adjective
  1. antiknock.
  2. Law. that authorizes law-enforcement officers to enter premises unannounced and without identifying themselves: a no-knock narcotics policy.
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Origin of no-knock

An Americanism dating back to 1965–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018