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
According to Us Weekly sources, the details were kept under lock and key—even from guests, who would be shuttled to and from their hotel to avoid leaks.
—
Emily Tannenbaum, Glamour, 28 Sep. 2025
The logline is being kept under lock and key, as well, though sources have described the project as a fugitive thriller set during Halloween.
—Matt Grobar, Deadline, 16 Sep. 2025
If he were apprehended, the rest of his days would surely be lived under lock and key.
—Manuel Muñoz, Literary Hub, 11 Sep. 2025
Her plans for a fan meet or performances stateside are also kept under lock and key.
—Laura Sirikul, Forbes.com, 9 Sep. 2025
See All Example Sentences for under lock and key
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Emily Tannenbaum, Glamour, 28 Sep. 2025
The logline is being kept under lock and key, as well, though sources have described the project as a fugitive thriller set during Halloween.
—Matt Grobar, Deadline, 16 Sep. 2025
If he were apprehended, the rest of his days would surely be lived under lock and key.
—Manuel Muñoz, Literary Hub, 11 Sep. 2025
Her plans for a fan meet or performances stateside are also kept under lock and key.
—Laura Sirikul, Forbes.com, 9 Sep. 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 19 Oct. 2025.
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