master-key

The janitor uses a master-key to unlock the supply closet.

Definition

1. Noun:
   • A key that opens several locks: A "master-key" is a key designed to open a set of locks that each have their own individual keys, typically used for convenience or control in buildings or systems.
   • A metaphorical key: Figuratively, a "master-key" refers to something that provides a universal solution or access to many different things, such as knowledge, understanding, or power.

Usage Examples

• Literal:

  • The janitor used the master-key to unlock all the classrooms in the school. (A key that opens multiple locks in a building.)
  • Only the manager possesses the master-key to the safe deposit boxes. (A key with special access privileges.)

• Figurative:

  • Education is often called the master-key to a better life. (Something that provides broad access or opportunity.)
  • Patience is the master-key to solving many interpersonal conflicts. (A universal approach or solution.)

Advanced Usage

• "master-key system": a lock system where a single master-key can open multiple locks, each also operable by its own unique key.

  • The hotel installed a master-key system for housekeeping staff. (A coordinated lock arrangement.)

• "to hold the master-key": to possess ultimate control or access.

  • The director held the master-key to the company's confidential files. (Had exclusive authority or means.)

Variants and Related Words

• Master-keyed (adj): describes a lock that can be opened by a master-key.

  • The cabinet is master-keyed for security purposes. (Configured to accept a master-key.)

• Passkey (n): a synonym for a master-key, often used for a key that opens many doors.

  • The security guard had a passkey to all office floors. (Another term for a master-key.)

Synonyms

• Passkey: a key that opens several locks.
• Skeleton key: a key with a simplified design that can open many locks (often historical).
• Universal key: a key that works on multiple locks.

Related Idioms

• The master-key to success: a phrase meaning the essential element that leads to achievement.

  • Hard work is often described as the master-key to success. (The crucial factor for achieving goals.)

• Master-key of the universe: a poetic or philosophical term for a fundamental principle or force.

  • Love is sometimes called the master-key of the universe. (A universal principle.)