Deadbolt
(noun)
A type of lock that is typically used on a door and is engaged by turning a key or thumbturn, providing additional security against unauthorized entry.
Origin:
The term 'deadbolt' is derived from the old english words 'dead' and 'bolt', meaning a bolt that is not moved by the latch.
Examples:
- The locksmith installed a new deadbolt on the front door to provide additional security.
- The apartment door had a deadbolt, chain lock, and a peephole for added safety.
- The deadbolt was stuck and wouldn't budge, even with the key in the lock.
- The deadbolt was the only thing standing between the burglars and the valuable items inside the house.
- The deadbolt on the door was so secure that even the fire department had trouble getting inside during the emergency.