单词	lockdown
释义	lockdown /ˈlɒkdaʊn / noun North American 1The confining of prisoners to their cells, typically in order to regain control during a riot: the lockdown has been in effect since October 1983... Administrators responded with an institution lockdown, confining all prisoners to their cells. Furthermore, they are typically barred from areas where ministry is most needed: maximum security prisons, solitary confinement blocks, and twenty-three-hour lockdowns. This final act of defiance precipitated a lockdown of the entire Texas state prison system. 1.1A state of isolation or restricted access instituted as a security measure: the university is on lockdown and nobody has been able to leave... Authorities responded by putting the entire city in lockdown. Security officials then put the nuclear station on lockdown. Harding High School, about two blocks east of the crime scene, was placed on lockdown for a short period in the morning.
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