holdback

(-bak′)

noun

  1. a thing that holds back; curb; check; hindrance
  2. ☆ a strap or iron attached to the shaft of a wagon, carriage, etc. and to the harness, to enable a horse to stop or back the vehicle

See holdback in American Heritage Dictionary 4

noun
  1. a. The act of holding back.
    b. Something held back.
  2. A device that retains or restrains.
  3. A strap or an iron catch between the shaft and the harness on a drawn wagon, allowing the horse to stop or back up.

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