downturn vs up-end

downturn

verb

  • To turn downwards 

  • To decline 

noun

  • A downward trend, or the beginnings of one; a decline. 

up-end

verb

  • To turn (something) upside down, to invert (something). 

How often have the words downturn and up-end occurred in a corpus of books? (source: Google Ngram Viewer )