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under lock and key

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

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

How to use under lock and key in a sentence

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