flexion vs pleach

flexion

noun
  • The state of being bent or flexed. 

  • Deviation from straightness. 

  • The act of bending a joint, especially a bone joint; the counteraction of extension. 

pleach

noun
  • A notch cut into a branch so that it can be bent when pleaching is carried out. 

  • An act or result of interweaving; specifically, (horticulture) a hedge or lattice created by interweaving the branches of shrubs, trees, etc. 

  • A branch of a shrub, tree, etc., used for pleaching; a pleacher. 

verb
  • To unite by interweaving, as (horticulture) branches of shrubs, trees, etc., to create a hedge; to interlock, to plash. 

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