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Master key

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master key

–noun
a key that will open a number of different locks, the proper keys of which are not interchangeable.

Origin:
1570–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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master key  
n.  A key that opens every one of a given set of locks. Also called passkey.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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