I can’t believe that people wait in line for twelve hours just to get some eco-friendly bags.
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means line up so the verb vocab version is to be lined up. You know this is the version where things are just lined up (you're not doing the lining up) because you keep saying boo (ぶ), why is everyone already lined up? I should have got here earlier so I don't have to wait (if you were doing the lining up yourself, you'd put yourself in the front, duh).
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: Only for you, when you visit Nara (なら), the deer there are to be lined up for you to inspect, as you are the deer inspector. If you don't know about Nara and its deer, you should look it up, they're pretty awesome.