You searched for: “prevents
prevent (verb), prevents; prevented; preventing
1. To stop or to avert something from happening: The town decided to improve the road conditions with an extra bicycle lane in order to prevent further accidents.
2, To keep a person or something from being active in a certain way: The extreme weather conditions with storms and heavy rain prevented the airplane to take off on time.

Tom prevented his sister entering the bedroom by standing in her way, so she had to push him away!

This entry is located in the following units: pre-, prae- (page 19) ven-, vent-, veni-, ventu- (page 6)
(a process by which nature prevents everything from happening all at once)
(Latin: a doorlike structure in a passageway that hinders or prevents the reflux or flowing back of its contents)