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no-knock

[ noh-nok ]
/ ˈnoʊˌnɒk /
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adjective

Law. relating to or denoting a policy that authorizes law-enforcement officers to enter premises unannounced and without identifying themselves: On the basis of an anonymous tip, the police had obtained a no-knock search warrant for drugs.

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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. 2021

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