sift vs tranche

sift

verb
  • To separate or scatter (things) as if by sieving. 

  • To sieve or strain (something). 

  • [+object] (archaic or old-fashioned) To scrutinise (someone or something) carefully so as to find the truth. 

  • [+ through (object)] To carefully go through a set of objects, or a collection of information, in order to find something. 

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 sift and tranche occurred in a corpus of books? (source: Google Ngram Viewer )