immobilize vs pin someone down

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. 

pin someone down

How often have the words immobilize and pin someone down occurred in a corpus of books? (source: Google Ngram Viewer )