master key

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English[edit]

English Wikipedia has an article on:
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Pronunciation[edit]

  • (file)

Noun[edit]

master key (plural master keys)

  1. A key designed to open a set of several locks; a passkey.
  2. (figurative) Any tool or technique that can solve many types of difficulty.
  3. (law enforcement, slang) A shotgun shell designed for breaching doors.

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