let out vs lock out

let out

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

  • To disclose. 

  • 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. 

lock out

verb
  • To prevent from accessing a data structure. 

  • To inadvertently prevent (a person, particularly oneself) from entering a place, by leaving it locked. 

noun
  • An event in which an employer bars employees from working as a tactic in negotiating terms of employment, particularly in response to a strike or threat to strike. 

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