rasper

plural raspers

1. A person who, or thing that, rasps or scrapes.
2. One who speaks with a rasping voice.
3. slangA fence that is challenging for a horse to jump over.

   When a horse becomes blown, on approaching a fence, you should pause for a second, and turn him round: it will greatly relieve him, and you stand a much better chance of getting over: and indeed, it is generally preferable to turn the horse round at a rasper, or large jump.

   1833, The Sportsman's Cabinet, and Town and Country Magazine