shoulder-strap vs tug

shoulder-strap

noun
  • Straps of leather or fabric, supporting a bag or rucksack when carried 

  • One of the two short straps connected to the front and back of a garment and going over the shoulders. 

  • An ornamental distinguishing band worn over the shoulder 

tug

noun
  • A trace, or drawing strap, of a harness. 

  • A dog toy consisting of a rope, often with a knot in it. 

  • A tugboat. 

  • An iron hook of a hoisting tub, to which a tackle is affixed. 

  • A sudden powerful pull. 

  • An act of male masturbation. 

verb
  • To masturbate. 

  • To tow by tugboat. 

  • To pull or drag with great effort. 

  • To pull hard repeatedly. 

How often have the words shoulder-strap and tug occurred in a corpus of books? (source: Google Ngram Viewer )