lockdown - definition and synonyms

noun [countable/uncountable] mainly American 

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/ˈlɒkˌdaʊn/
singularlockdown
plurallockdowns
  1. 1
    an occasion or time when prisoners are locked in their cells

    The governor ordered a lockdown of all state prisons.

    on lockdown:

    Maximum security involves being on 23-hour lockdown with absolutely nothing to do.

    This meaning is based on one submitted to the Open Dictionary from United Kingdom on 5/10/2015
  2. 2
    an occasion or time when access to a place is restricted because of some danger

    Authorities lifted the lockdown after searching all four schools and deeming them safe.

    on lockdown:

    The US Capitol and the White House were placed on lockdown after an ’active shootersituation was reported.

    This meaning is based on one submitted to the Open Dictionary from United Kingdom on 5/10/2015