1. a lock with a bolt that is moved by turning a key or knob, providing extra security for a door

1. to secure with a deadbolt lock

Examples

• She installed a deadbolt on her front door for added security.
• The deadbolt requires a key to open from the outside.
• Make sure to deadbolt the door before going to bed.
• The heavy deadbolt made a satisfying click as it locked into place.
• He forgot his keys and couldn’t unlock the deadbolt.
• The apartment came with both a regular lock and a deadbolt.
• She always deadbolts her door when she’s home alone.