A ruckus is a noisy disturbance or commotion that disrupts the usual calm. When a classroom erupts into chaos with everyone talking at once, that's a ruckus. When neighbors complain about loud music and shouting at midnight, they're complaining about the ruckus.

The word captures noise combined with disorder and disruption. A concert might be loud, but if the crowd starts pushing and yelling and knocking over chairs, now there's a ruckus. If your dog spots a squirrel and goes berserk, barking and leaping at the window, you might say the dog is “causing a ruckus” or “raising a ruckus.”

Sometimes people deliberately raise a ruckus to get attention for something they care about. A community might raise a ruckus at a town meeting to protest a bad decision. The phrase suggests making enough noise and fuss that people have to pay attention.

The word often appears in phrases like “What's all the ruckus about?” when someone wants to know why everything suddenly got so loud and chaotic.