under lock and key

Securely locked up, as in He keeps the wine under lock and key. [First half of 1500s]

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A Peaky Blinders film will be released soon by Netflix, although Murphy said the plot line is still under lock and key.

From BBC

Wirtz could provide an option on the flank, but Liverpool's wide areas appear to be under lock and key.

From BBC

He could provide an option on the flank, but Liverpool's wide areas appear to be under lock and key.

From BBC

His sister can’t even imagine what he gets up to with all those suspect books he keeps piled up under lock and key.

"I didn’t appreciate its significance then, it was kept in our house in Caerphilly but my dad kept it under lock and key," she said.

From BBC

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