accroach vs work in

accroach

verb
  • To hook, or draw to oneself as with a hook. 

  • To usurp, as jurisdiction or royal prerogatives. 

  • To encroach. 

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 accroach and work in occurred in a corpus of books? (source: Google Ngram Viewer )