словарь английский - английский
- to do something in order to stop something else from happening на английском языке:
1. 
to prevent
That will help to prevent the situation worsening
Several studies show that drinking coffee helps to prevent some illnesses.
to prevent accidents/crime
You should make sure the leg is supported to prevent unnecessary movement.
They couldn't do anything to prevent the problem.
It's better to prevent than to cure.
