racing briefs vs thong

racing briefs

noun
  • A briefs-style male swimsuit typically worn in competitive swimming and diving. 

thong

noun
  • An undergarment or swimwear consisting of very narrow strips designed to cover just the genitals and nothing more. 

  • The largest section of a bullwhip constructed of many straps of braided leather. 

  • A strip of leather. 

  • An item of footwear, usually of rubber, secured by two straps which join to pass between the big toe and its neighbour. 

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