master key

Definitions of master key
  1. noun
    key that secures entrance everywhere
    synonyms: master, passe-partout, passkey
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    types:
    skeleton key
    a passkey with much of the bit filed away so that it can open different locks
    type of:
    key
    metal device shaped in such a way that when it is inserted into the appropriate lock the lock's mechanism can be rotated
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