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What does deadbolt mean?

Looking for the meaning or definition of the word deadbolt? Here's what it means.

Noun
  1. The part of the lock which is moved when the key is engaged.
  2. A kind of lock in which the bolt (moving portion) is held in position by the cylinder rather than by a spring and so can not be retracted except by turning the cylinder.
Verb
  1. (transitive) To fasten or secure with a deadbolt.
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