detach vs work in

detach

verb
  • To take apart from; to take off. 

  • To separate for a special object or use. 

  • To come off something. 

work in

verb
  • Used other than figuratively or idiomatically: see work, in. 

  • To find time or space for, amid other things. 

  • To work out using a machine in between the sets of someone who is already using that machine. 

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