incurvate vs zig

incurvate

verb
  • To bend (especially inwards); to give a curved shape to. 

  • to have a curved or bent shape; to bend or curve inwards. 

adj
  • bending inwards. 

  • Curved; bent; crooked. 

zig

verb
  • To make such a turn. 

noun
  • A sudden or sharp turn or change of direction. 

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