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.
The hard thing about learning how to parallel park is trying to get the car close enough to the curb without hitting it. A curb is the edge of the sidewalk beside the road. When you're using the word curb as a noun, it's the raised edging beside a street. When curb is a verb, it means to restrain or hold back, like when you curb your impulse to laugh while watching a badly acted play.