The phrase "to gear up" means to prepare or get ready for something. It can be used in a variety of contexts, such as preparing for a physical activity (e.g., getting dressed and putting on protective equipment), mentally preparing oneself for an event or task (e.g., focusing one's thoughts and gathering information), or readying equipment for use (e.g., checking and maintaining tools). The phrase implies that the person is taking active steps to get ready, often by putting on necessary items or adjusting their mindset.