Definition of "strapper"

strapper

noun
plural strappers
1. A large, strong, robust person (usually a man).
2. A person who works with straps, as on leather goods.
3. One who straps horses; now, specifically, someone employed to attend and groom racehorses.
  Quotations
  I was, however, but a very brief period employed as a strapper, as from the care and pains which I took in cleaning and watering the horses they soon mended in their jaded, worn-out appearance, for they were regularly fed, because I was regularly sober, a state, I have been informed, in which my predecessor was never in after mid-day.
  1835, The Veterinarian: A Monthly Journal of Veterinary Science
  On large establishments a head-man superintends the strappers, and the general management of the horses.
  1855, John Stewart, The Stable Book
  A boy was called a strapper because when you cleaned and dressed a horse properly, you had a nice flat towel, and you used to hit them on all the muscles.
  2011, Jan Wositzky, Me & Phar Lap: The Remarkable Life of Tommy Woodcock
4. (archaic) A cow which yields a small amount of milk.
  Quotations
  “Nabla, Nabla,” says he, “them was the true words of Father Luke's when he said them would lend him a strapper would be repaid twofold. Here comes our own strapper back to us in company with a brave lump of a bullockeen. Faith,” says he, “Father Luke, you're the man for my money, and if ever ye want a strapper again, just tip me the word, and I'll go bail ye'll not want one long; and if ye want two, why, I'll steal one for ye.”
  1905, Lippincott's Monthly Magazine: A Popular Journal of General Literature
5. (electronics) A wire that joins two light switches so that a light can be turned off or on from either switch.