tranche vs trench

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. 

trench

verb
  • To cut furrows or ditches in. 

  • To dig or cultivate very deeply, usually by digging parallel contiguous trenches in succession, filling each from the next. 

  • To excavate an elongated pit for protection of soldiers and or equipment, usually perpendicular to the line of sight toward the enemy. 

  • To have direction; to aim or tend. 

  • To cut; to form or shape by cutting; to make by incision, hewing, etc. 

  • To excavate an elongated and often narrow pit. 

  • To invade, especially with regard to the rights or the exclusive authority of another; to encroach. 

noun
  • A long, narrow ditch or hole dug in the ground. 

  • A narrow excavation as used in warfare, as a cover for besieging or emplaced forces. 

  • A pit, usually rectangular with smooth walls and floor, excavated during an archaeological investigation. 

  • A trench coat. 

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