1. To think about something carefully and at length: This is the most common meaning of "mull." It's often used to describe someone pondering a decision or trying to understand a complex issue.
* Example: "I'm still mulling over your job offer. I need some time to think it through."
2. To heat and soften something, typically wine or spices, for a period of time to extract flavor: This is a less common meaning, often used in the context of cooking or beverage preparation.
* Example: "We mulled the cider with cinnamon and cloves for a warm, festive drink."