Origin of deadboltso named probably because the bolt cannot move by itself: see dead (adjective)
a lock for a door, with a square-headed bolt that can be moved only by turning the key or a knob: it has no spring
A bolt on a lock that shifts only when the key or a small knob on one side of the lock is turned.
- Installing a deadbolt lock to discourage burglars and a smoke detector can also quality a policyholder to a break on the cost of insuring his or her home.
- She.d cracked the door to her heart for Rhyn to shove his foot in the door and now needed to close, lock, and deadbolt it closed again.