carry out vs let up

carry out

verb
  • To execute or perform; to put into operation; to do. 

  • To hold while moving it out. 

  • To fulfill. 

let up

verb
  • To cease or stop (doing something intense). 

  • To cease or stop. 

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