Curb/kɜːrb/ Definition 1 of 3Pro Tip 1/3Stop or Slow Curb means to stop something gradually, not all at once. Efforts to curb smoking are working, with fewer people smoking each year. Pro Tip 2/3Policy-Driven Curb often relates to laws or policies designed to control an activity or behavior. The new policy was introduced to curb illegal parking in the city. Pro Tip 3/3Figurative Use 'Curb' can be used as a metaphor for limiting anything intangible. We need to curb the rising discontent among the employees.