lockdown

lock down |ˈläkˌdoun ˈlɑːkdaʊn | ▶noun the confining of prisoners to their cells, typically after an escape or to regain control during a riot. • a state of isolation or restricted access instituted as a security measure: the university is on lockdown and nobody has been able to leave.

lockdown

lock |down |ˈlɒkdaʊn | ▶noun N. Amer. the confining of prisoners to their cells, typically in order to regain control during a riot. • a state of isolation or restricted access instituted as a security measure: the university is on lockdown and nobody has been able to leave.