The last hurdle before graduation.
Hurdle a problem.
A large plastic barrier that an athlete has to jump over during a triathlon is an example of a hurdle.
When you have no money to go to college, the lack of funds is an example of a hurdle that you must overcome before you can attend school.
When you take part in a race where there are a series of 3-foot high barriers on the track that you have to run and jump over, this is an example of a time when you hurdle.