cleave vs tranche

cleave

verb
  • To split. 

  • To make or accomplish by or as if by cutting. 

  • Followed by to or unto: to adhere, cling, or stick fast to something. 

  • To split (a complex molecule) into simpler molecules. 

  • Of a crystal, to split along a natural plane of division. 

  • To break a single crystal (such as a gemstone or semiconductor wafer) along one of its more symmetrical crystallographic planes (often by impact), forming facets on the resulting pieces. 

  • To split or sever something with, or as if with, a sharp instrument. 

noun
  • Flat, smooth surface produced by cleavage, or any similar surface produced by similar techniques, as in glass. 

tranche

verb
  • To divide into tranches. 

noun
  • A distinct subdivision of a single policyholder's benefits, typically relating to separate premium increments. 

  • One of a set of classes or risk maturities that compose a multiple-class security, such as a CMO or REMIC; a class of bonds. Collateralized mortgage obligations are structured with several tranches of bonds that have various maturities. 

  • A pension scheme's or scheme member's benefits relating to distinct accrual periods with different rules. 

  • A slice, section or portion. 

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