The term "tool up" refers to the process of preparing oneself or one's resources for a particular task or goal. Synonyms for this phrase include "gear up," which implies actively preparing oneself with the necessary tools and equipment, and "ready oneself," which suggests a mental and emotional adjustment to the task at hand. Other possibilities include "equip oneself," "prepare oneself," and "get set," all of which convey the idea of making oneself capable and ready to take on a challenge. Ultimately, the choice of synonym will depend on the specific context and tone of the conversation or situation.