Definition of master key in English:

master key

Line breaks: mas¦ter key

noun

A key that opens several locks, each of which also has its own key: the master key for all the safes in the department
More example sentences
  • The change key will open only that specific lock, while the master key will open that lock and several others in a group.
  • She used her master key to open the lock, and began to open the gate.
  • I got the master key and opened the door and that's when I saw him in the bath.

Definition of master key in:

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