Dreams about being chased often indicate feelings of anxiety or stress in waking life. The big rat in your dream could represent something that you find repulsive or threatening. It may symbolize a fear or an issue that you're trying to avoid but can’t escape from.

Consider what the rat might represent for you personally. Is there a situation or a person in your life that feels overwhelming or that you want to avoid? This dream may be prompting you to confront these feelings or issues rather than run away from them.

Reflecting on the emotions you felt during the chase can also provide insight. Were you scared, anxious, or determined? Understanding your emotional response can help you address the underlying concerns in your waking life.