safety lock

safety lock — noun

1. a lock with a special mechanism that makes it very difficult to open without the

1.nounB2
Definition

a lock with a special mechanism that makes it very difficult to open without the correct key, designed to stop thieves or unauthorised people from entering a container, door, or device

Example

The bank added a second safety lock to the vault door after the attempted robbery.

collocation: safety lock on [door/vault]

Wei bought a safety lock for his diary so his sister could not read it.

Common collocations
  • install a safety lock
  • fit a safety lock
  • safety lock on something
  • built-in safety lock
  • heavy-duty safety lock
Synonyms
  • security lock

    often used interchangeably, though 'security lock' can also refer to electronic systems

  • pick-proof lock

    stronger claim; not all safety locks are truly impossible to pick

  • deadbolt

    a specific type of door lock that requires turning a key or knob, does not always have anti-pick features

Grammar Patterns

safety lock on [container/door]

Usage Note

Commonly used for containers, doors, and devices that store valuable or dangerous items. Unlike a simple padlock, a safety lock uses internal pins or electronic parts that resist picking tools.

Common Mistakes

I need a safety lock for my suitcase password.
I need a safety lock for my suitcase.
a safety lock is the hardware itself, not the password or combination you set.

Synonym discussion

Sense: noun/1

A safety lock specifically emphasises protection against lock-picking — the internal mechanism is built to resist tools such as tension wrenches and picks. A security lock is a broader term that may include electronic keypads, alarms, or card readers; it describes any lock designed for security but not necessarily with anti-pick features. A deadbolt is a type of door lock that slides a solid metal bolt into the door frame; many deadbolts are also security locks, but a standard deadbolt does not offer the same pick resistance as a dedicated safety lock. A padlock is a portable lock with a U-shaped shackle; while some padlocks advertise themselves as safety locks, they are generally easier to cut or pick than a fixed safety lock built into a door. For a diary, a small padlock with a key is sufficient; for a gun cabinet, a safety lock with a combination code is far more secure.

safety lock ↗security lockdeadbolt ↗padlock ↗

Etymology

Old EnglishOld FrenchEnglish

A compound noun formed from 'safety' (the state of being protected from danger, from Old French 'sauveté') and 'lock' (a fastening device, from Old English 'loc'). The term was used in the late 19th century as lock manufacturers began adding anti-pick features to their products and marketing them under names like 'safety lock' and 'security lock'.