To speak up means to say something when you might otherwise stay quiet, especially when it takes courage or when your voice needs to be heard. When your teacher asks if anyone has questions and you raise your hand to ask about something confusing, you're speaking up. When you notice a classmate being treated unfairly and you tell an adult, you're speaking up.

Sometimes speaking up means talking louder so others can actually hear you. If you're mumbling your answer and your teacher says “speak up, please,” she wants you to use a clearer, stronger voice.

More often, though, speaking up is about finding the courage to say what you think or know, even when it feels uncomfortable. You might need to speak up when you see someone breaking the rules, when a group decision seems wrong, or when you have an idea that could help solve a problem.

The phrase suggests that speaking takes some effort or bravery in that moment. You don't speak up about what you want for lunch. You speak up when something important is at stake and staying silent would mean missing a chance to make things better or fairer. Speaking up can feel risky, but it is one way people try to solve problems and stand up for what matters.