The word "curb" refers to a restriction or limitation imposed on something, often aimed at controlling or regulating its growth or behavior. It can also mean to restrain or hold back. For example, you might curb your spending by setting a budget, or curb a habit by implementing self-discipline.
The word "curb" originates from the Middle English word "kerb" or "curb," which comes from the Old French term "courbe," meaning "to bend." It has its roots in the Latin word "curvare," which means "to bend." Over time, "curb" evolved to encompass the meanings of both physical restraints (like a physical edge or border) and abstract limitations.