buckling vs defending

buckling

adj
  • Wavy; curly, as hair. 

noun
  • The act of fastening a buckle. 

  • A folding into hills and valleys. 

  • The action of collapsing under pressure or stress. 

  • A young male domestic goat of between one and two years. 

  • Smoked herring. 

defending

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