Blood, sweat and tears Definition 1 of 2Pro Tip 1/3Emotional Intensity Conveys more than just hard work, but immense personal investment and determination. Winning the championship required her blood, sweat and tears. Pro Tip 2/3Not Literal A metaphorical expression, does not mean actual blood or tears. His first novel took blood, sweat and tears to complete. Pro Tip 3/3Serious Endeavors Used for tasks that require significant effort, not for simple or easy tasks. Becoming a doctor involves blood, sweat and tears.