appropriate vs work in

appropriate

adj
  • Suitable or fit; proper. 

  • Suitable to the social situation or to social respect or social discreetness; socially correct; socially discreet; well-mannered; proper. 

verb
  • To take to oneself; to claim or use, especially as by an exclusive right. 

  • To set apart for, or assign to, a particular person or use, especially in exclusion of all others; with to or for. 

  • To annex (for example a benefice, to a spiritual corporation, as its property). 

work in

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

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

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

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