B1
to stop something from happening or someone from doing something
Dictionary examples:
I put a 'No Entry' sign on my fridge to prevent midnight snacking. (0.0)
I covered my vegetables in chocolate to prevent my kids from eating them. (0.0)
I learned to juggle to prevent dropping things in the kitchen. (0.0)
to prevent accidents/crime (19.5)
Members of the public were prevented from entering the building. (26.9)