let out vs unbar

let out

verb
  • To disclose. 

  • Of a school: to finish for the day or term, allowing the pupils to go home. 

  • To rent out. 

  • Of sound, to emit. 

  • To allow to operate at higher speed by adjusting controls. 

  • To release. 

  • To enlarge by adjusting one or more seams. 

unbar

verb
  • To remove a prohibition. 

  • To remove an impediment that obstructs the passage of (someone or something). 

  • To unlock or unbolt a door that had been locked or bolted with a bar. 

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