
1) Imprisonment 2) Internment 3) Security precaution
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https://www.crosswordclues.com/clue/lockdown

There are several definitions for the term lockdown, the most common of which pertains to a state of containment or a restriction of progression. A lockdown is an emergency protocol to prevent people or information from escaping, which usually can only be ordered by someone in command. Lockdowns are also used to protect people inside a facility or...
Found on
http://en.wikipedia.org/wiki/Lockdown
[House] `Lockdown` is the seventeenth episode of the sixth season of the American medical drama House. It aired on April 12, 2010. This episode also marks the directorial debut of Hugh Laurie on the show. This episode has five storylines: When the hospital is sent into lock-down mode due to a missing infant, all of the doctors must remain w...
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http://en.wikipedia.org/wiki/Lockdown_(House)
[Transformers] Lockdown is the name of several characters from the Transformers franchise. He is usually depicted as a ruthless bounty hunter nominally aligned with the Decepticons. ==Transformers: Generation 1== Lockdown will pay top dollar to get what he wants. Like any bounty hunter, he`s all business and does whatever it takes to haul h...
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http://en.wikipedia.org/wiki/Lockdown_(Transformers)

Lockdown is prison slang for confined to the cell.
Found on
http://www.probertencyclopaedia.com/browse/ZL.HTM
noun the act of confining prisoners to their cells (usually to regain control during a riot)
Found on
https://www.encyclo.co.uk/local/20974

the confining of prisoners to their cells, as following a riot or other disturbance.
Found on
https://www.infoplease.com/dictionary/lockdown

The frustrating but neccessary community quarantine measures take to contain the spread of a disease. Large scale physical distancing measures and movement restrictions known as a ‘lockdown’ can slow COVID-19 transmission by limiting contact between people.
Found on
https://www.unicef.org.au/blog/resources/vaccine-glossary
No exact match found.