acid test vs item

acid test

noun
  • A rigorous test or appraisal of the quality or worth of something. 

  • In the 1960s, a party based around the use and advocacy of the psychedelic drug LSD ("acid"). 

item

noun
  • A question on a test, which may include its answers. 

  • Two people who are having a romantic or sexual relationship with each other. 

  • A line of text having a legal or other meaning; a separate particular in an account. 

  • An object that can be picked up for later use. 

  • A distinct physical object. 

  • A short article in a newspaper. 

  • A matter for discussion in an agenda. 

verb
  • To make a note of. 

adv
  • likewise 

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