under lock and key
idiom
: in a room, box, etc., that is locked
The jewels are kept under lock and key.
The prisoner is being kept/held under lock and key.
Examples of under lock and key in a Sentence
Recent Examples on the Web
But keeping a potential sale under lock and key can have its drawbacks.
—
Julia Zaltzman, Robb Report, 2 July 2025
Others have moved high-value cards, like those for popular retailers, behind the counter or put them under lock and key.
—Matthew Adams, Fort Worth Star-Telegram, 6 June 2025
Abdullah al-Muhajir, is currently under lock and key in a maximum security prison after being arrested in 2002 and later convicted for planning plotting a radiological bomb a.k.a.
—Dominic Patten, Deadline, 20 June 2025
Details are being kept under lock and key but the project has been described as Memento meets Raiders of the Lost Ark.
Skydance did not comment on the dealmaking.
Andrew Schneider will exec produce.
—Borys Kit, HollywoodReporter, 22 May 2025
See All Example Sentences for under lock and key
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Julia Zaltzman, Robb Report, 2 July 2025
Others have moved high-value cards, like those for popular retailers, behind the counter or put them under lock and key.
—Matthew Adams, Fort Worth Star-Telegram, 6 June 2025
Abdullah al-Muhajir, is currently under lock and key in a maximum security prison after being arrested in 2002 and later convicted for planning plotting a radiological bomb a.k.a.
—Dominic Patten, Deadline, 20 June 2025
Details are being kept under lock and key but the project has been described as Memento meets Raiders of the Lost Ark.
Skydance did not comment on the dealmaking.
Andrew Schneider will exec produce.
—Borys Kit, HollywoodReporter, 22 May 2025
See All Example Sentences for under lock and key
Cite this Entry
“Under lock and key.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/under%20lock%20and%20key. Accessed 14 Jul. 2025.
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