"Repel" or "reject" refers to the act of refusing or dismissing something or someone. This can occur in various contexts, such as social interactions, scientific processes, or even in nature. For example, when a person feels uncomfortable with a proposal, they may repel the idea by saying no. In science, the term can describe forces that push away objects, like how magnets can repel each other when similar poles face one another. In biology, certain organisms may repel predators or parasites through chemical means, ensuring their survival in the ecosystem.