Definition

1. Noun:
   • A type of lock that is opened by aligning a set of moving components (typically dials marked with numbers or letters) in a specific, predetermined sequence, rather than by using a physical key.

Usage

• A combination lock is used to secure items like lockers, safes, bicycles, or suitcases. The user must know the correct sequence (the combination) to open it.
• The term is always used as a compound noun: "combination lock."

Examples

Advanced Usage

• "To crack/pick a combination lock": To open a combination lock without knowing the correct code, often through manipulation or deduction.
  • In the movie, the spy knew how to crack the combination lock in under a minute.
• "Digital combination lock": A modern version where the sequence is entered on a keypad instead of by turning dials.
  • The new apartment building uses digital combination locks on all the main doors.

Variants and Related Words

• Padlock (n): A detachable lock with a hinged or sliding shackle. A combination lock is often a type of padlock.
  • He secured the gate with a sturdy padlock.
• Safe (n): A strong, lockable box for securing valuables, which often uses a combination lock mechanism.
  • The jewels were kept in the wall safe.

Synonyms

• Cipher lock: A lock opened by entering a numeric code, often used interchangeably with "combination lock," especially for keypad types.
• Keyless lock: A general term for any lock that does not require a physical key.

Related Phrases

• "To set the combination": To choose and configure the secret sequence for opening the lock.
  • Remember to set the combination to something you won't forget.
• "To work the combination": To perform the actions (turning dials, pressing buttons) needed to input the code.
  • He carefully worked the combination and opened the case.

Related Idioms

• "A combination of factors": While not directly about the lock, this idiom uses the core word "combination" to mean a mixture of different elements. It highlights the word's fundamental meaning of joining specific parts in a set.
  • The decision was based on a combination of factors, including cost and safety.

Noun

1. lock that can be opened only by turning dials in a special sequence