Mutagen vs Carcinogen Mutagen and carcinogen are two terms that have a lot in common. There is a potential that a single substance could be both of them at the same time and be only one of the two, as well.
A curb bit is a type of bit used for riding horses that uses lever action. It includes the pelham bit and the Weymouth curb along with the traditional curb bit used mainly by Western riders. Kimblewicks or Kimberwickes are modified curb bits, and a curb bit is used in a double bridle along with a bradoon.
Primary Meanings of curb. 1  n the act of restraining power or action or limiting excess. 2  n a horse's bit with an attached chain or strap to check the horse. 3  v lessen the intensity of; temper; hold in restraint; hold or keep within limits. 4  v place restrictions on. 5  v to put down by force or authority.