become rooted to the spot vs immobilize

become rooted to the spot

immobilize

verb
  • To modify a surface such that things will not stick to it 

  • To tie up a capital: make a capital investment that makes that capital unavailable. 

  • To render motionless; to stop moving or stop from moving. 

How often have the words become rooted to the spot and immobilize occurred in a corpus of books? (source: Google Ngram Viewer )