chock vs let out

chock

verb
  • To make a dull sound. 

  • To stop or fasten, as with a wedge, or block; to scotch. 

  • To insert a line in a chock. 

noun
  • Any fitting or fixture used to restrict movement, especially movement of a line; traditionally was a fixture near a bulwark with two horns pointing towards each other, with a gap between where the line can be inserted. 

  • Any object used as a wedge or filler, especially when placed behind a wheel to prevent it from rolling. 

adv
  • Entirely; quite. 

let out

verb
  • Of sound, to emit. 

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

  • To disclose. 

  • To rent out. 

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

  • To release. 

  • To enlarge by adjusting one or more seams. 

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