deadbolt

A deadbolt is a type of lock that you need a key to open. It's very common to have a deadbolt on an apartment door or the front door of a house.

When you turn a key in the lock of a deadbolt, the bolt slides in or out of an opening in the door jamb. Deadbolts are considered to be secure locks that are difficult to open without a key, especially when compared to a spring-loaded lock, the kind you see in the center of a doorknob. While spring latches can be pushed back manually, deadbolts can't — which is why they're called deadbolts. They're dead, or unmovable.

Definitions of deadbolt
  1. noun
    the part of a lock that is engaged or withdrawn with a key
    synonyms: bolt
    see moresee less
    types:
    safety bolt, safety lock
    a bolt that cannot be moved from outside the door or gate
    type of:
    bar
    a rigid piece of metal or wood; usually used as a fastening or obstruction or weapon
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