locate vs pin down

locate

verb
  • To find out where something is located. 

  • To designate the site or place of; to define the limits of (Note: the designation may be purely descriptive: it need not be prescriptive.) 

  • To place oneself; to take up one's residence; to settle. 

  • To place; to set in a particular spot or position. 

pin down

verb
  • To identify something (e.g. a decision or plan) clearly or specifically. 

  • To hold the opponent back-first so both his or her shoulders touch the mat or ground. 

  • To corner somebody in order to get a firm answer. 

  • To attach or secure with pins. 

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