1. an official rule that forbids something

1. to officially forbid something

Examples

• The city banned smoking in all public buildings.
• The school will ban cell phones during class hours.
• There is a ban on plastic bags in this state.
• The government imposed a ban on imported goods.
• They lifted the ban on outdoor concerts last month.
• The restaurant has a strict ban on outside food.
• Officials may ban large gatherings during emergencies.