hesitate vs percolate

hesitate

verb
  • To utter with hesitation or to intimate by a reluctant manner. 

  • To stammer; to falter in speaking. 

  • To stop or pause respecting decision or action; to be in suspense or uncertainty as to a determination. 

percolate

verb
  • To spread slowly or gradually; to slowly become noticed or realised. 

  • To pass a liquid through a porous substance; to filter. 

  • To make (coffee) in a percolator. 

  • To drain or seep through a porous substance. 

noun
  • A liquid that has been percolated. 

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