curb vs rowel

curb

noun
  • A riding or driving bit for a horse that has rein action which amplifies the pressure in the mouth by leverage advantage placing pressure on the poll via the crown piece of the bridle and chin groove via a curb chain. 

  • Something that checks or restrains; a restraint. 

  • A swelling on the back part of the hind leg of a horse, just behind the lowest part of the hock joint, generally causing lameness. 

  • A concrete margin along the edge of a road; a kerb (UK, Australia, New Zealand) 

  • A sidewalk, covered or partially enclosed, bordering the airport terminal road system with adjacent paved areas to permit vehicles to off-load or load passengers. 

  • A raised margin along the edge of something, such as a well or the eye of a dome, as a strengthening. 

verb
  • To rein in. 

  • To bend or curve. 

  • To furnish with a curb, as a well; to restrain by a curb, as a bank of earth. 

  • To crouch; to cringe. 

  • To damage vehicle wheels or tires by running into or over a pavement curb. 

  • To check, restrain or control. 

  • To bring to a stop beside a curb. 

rowel

noun
  • A little flat ring or wheel on a horse's bit. 

  • A roll of hair, silk, etc., passed through the flesh of a horse in the manner of a seton in human surgery. 

  • The small spiked wheel on the end of a spur. 

verb
  • To apply the spur to. 

  • To fit with spurs. 

  • To incite; to goad. 

  • To use a rowel on (something), especially to drain fluid. 

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