The word 不惜 is formed through a conceptual fusion where the negating character 不 (not) is applied directly to the character 惜 (to treasure, to spare, to regret), creating a unified idea that means “not to treasure or spare” something. This combination expresses a mindset of deliberate disregard for cost, consequence, or personal sacrifice, implying a conscious decision to proceed without holding back or regretting the expenditure of resources, effort, or even one’s own well-being in pursuit of a goal.