infuse vs work in

infuse

verb
  • To inspire; to inspirit or animate; to fill (with). 

  • To instill as a quality. 

  • To steep in a liquid, so as to extract the soluble constituents (usually medicinal or herbal). 

  • To cause to become an element of something; to insert or fill. 

  • To undergo infusion. 

  • To make an infusion with (an ingredient); to tincture; to saturate. 

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