filibustered
It was on a test I took and I had no clue what it meant, but it stuck in my mind for some reason so when I got home I dictionary.com-ed it. It's some political term (how can they even expect me to know that?) about using "irregular or obstructive tactics to impede the legislation".
If you're an American I would presume they expected you to know it because it is not only a political tactic, but a very specific one unique to the Senate.
A filibuster is, contrary to dictionary.com, a legitimate means of obstruction where a Senator can speak on any topic at all - even reading the phone book - for as long as he/she chooses, in order to block a vote on legislation. It is a formal tool in the Senate, and requires a 2/3rds (at least off the top of my head I think it's two thirds) vote to overcome it.
It's been used rather famously in the past, and threatened numerous other times, so I would hesitate to categorize it as "irregular."
And if you're not an American, but studying politics, you still ought to know it.