To belabor a point means to keep explaining or discussing something long after everyone already understands it. When you belabor an idea, you repeat it over and over, adding unnecessary details and examples even though people got it the first time.

Imagine a teacher explaining how to multiply fractions. After showing the steps once clearly, they explain it again. Then again. Then they draw more diagrams. Then they create another example. And another. At some point, the whole class is thinking, “We get it already!” That's belaboring the point.

You might also belabor someone with complaints or criticism, going on and on about what they did wrong instead of making your point and moving on. If your friend spilled juice on your book and you spend the next hour reminding them how careless they were, you're belaboring them with criticism.

When you belabor something, you're working it over too much, like kneading bread dough long after it's ready.