lockdown - definition and synonyms

noun
  1.   From our crowdsourced Open Dictionary
    1
    a occasion when prisoners are confined to their cells

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

    Submitted from United Kingdom on 05/10/2015
  2.   From our crowdsourced Open Dictionary
    2
    an occasion when access to a place is restricted because of some danger

    Usually, we get the announcement: “We are in a lockdown. This is a drill.”

    Submitted from United Kingdom on 05/10/2015