1. to stop something from happening or someone from doing something
Usage: third person singular present tense of ‘prevent’

Examples

• The vaccine prevents many serious diseases.
• A good diet prevents health problems later in life.
• The security system prevents unauthorized access to the building.
• Regular maintenance prevents equipment breakdowns.
• The new law prevents companies from polluting the river.
• Sunscreen prevents skin damage from UV rays.
• The fence prevents animals from entering the garden.