corncob vs pin down

corncob

verb
  • To defeat (someone) who then refuses to admit defeat. 

  • To disintegrate by the blades becoming severed from the axis 

noun
  • The central cylindrical core of an ear of corn (maize) on which the kernels are attached in rows. 

pin down

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

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

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

  • To attach or secure with pins. 

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