lock in vs shut up

lock in

verb
  • To secure (someone or something) in a locked enclosure. 

  • To fix the value of (something potentially variable). 

  • To prevent from escaping or deteriorating. 

shut up

verb
  • To put (someone or something) in a secure enclosed space, such as a room or container. 

  • Of a person, to stop talking or (of a person or thing) making noise. 

  • To terminate (a business). 

  • To close (a building) so that no one can enter. 

adj
  • Closed up or off, as in a building that no one is to enter. 

intj
  • Stop talking, crying, etc. 

  • I don't believe it!, no way! 

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