let up vs magnify

let up

verb
  • To cease or stop. 

  • To cease or stop (doing something intense). 

magnify

verb
  • To make (something) appear larger by means of a lens, magnifying glass, telescope etc. 

  • To make (something) larger or more important. 

  • To praise, glorify (someone or something, especially God). 

  • To make (someone or something) appear greater or more important than it is; to intensify, exaggerate. 

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