deadbolt vs unlock

deadbolt

noun
  • A kind of lock in which the bolt (moving portion) is held in position by the cylinder rather than by a spring and so cannot be retracted except by turning the cylinder. 

  • The part of the lock which is moved when the key is engaged. 

verb
  • To fasten or secure with a deadbolt. 

unlock

noun
  • The act of unlocking something. 

verb
  • To undermine something that has control over a situation; to find a way to counter or oppose. 

  • To make available. 

  • To configure (a mobile phone) so that it is not bound to any particular carrier. 

  • To undo or open a lock or something locked by, for example, turning a key, or selecting a combination. 

  • To obtain access to something; to meet the requirements of a security or protection system. 

  • To disclose or reveal previously unknown knowledge or potential. 

  • To be or become unfastened or unrestrained. 

How often have the words deadbolt and unlock occurred in a corpus of books? (source: Google Ngram Viewer )