holdback vs thong

holdback

noun
  • The strap or part of the harness so used. 

  • The projection or loop, on the thill of a vehicle, to which a strap of the harness is attached, to hold back a carriage when going downhill, or in backing. 

  • restraint (act or result of holding back, device that restrains) 

thong

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

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

  • A strip of leather. 

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

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