under lock and key
IdiomsExample Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
People tend not to realize the information they’re sharing with AI models belongs under lock and key, she says, especially matters of personal finance, for instance.
From The Wall Street Journal ● Jun. 28, 2026
Maybe we’ll find ourselves under lock and key across the street in the Eisenhower Executive Office Building.
From Salon ● Nov. 7, 2025
A Peaky Blinders film will be released soon by Netflix, although Murphy said the plot line is still under lock and key.
From BBC ● Sep. 19, 2025
His sister can’t even imagine what he gets up to with all those suspect books he keeps piled up under lock and key.
From Los Angeles Times ● May 21, 2025
Danny was about to ask why he kept it under lock and key, especially since none of the other doors in the house had any sort of security.
From "The Way to Rio Luna" by Zoraida Cordova
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
