corncob vs nail down

corncob

verb
  • To disintegrate by the blades becoming severed from the axis 

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

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

nail down

verb
  • to attach with nails 

  • to make something (e.g. a decision or plan) firm or certain 

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