safety lock

Definitions of safety lock
1

n a bolt that cannot be moved from outside the door or gate

Synonyms:
safety bolt
Type of:
bolt, deadbolt
the part of a lock that is engaged or withdrawn with a key

n guard consisting of a locking device that prevents a weapon from being fired

Synonyms:
safety catch
Type of:
guard, safety, safety device
a device designed to prevent injury or accidents

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