汗水 literally means 'sweat water' — combining 汗 (hàn), meaning 'sweat', and 水 (shuǐ), meaning 'water'. Though it refers to the physical fluid excreted by the body during exertion or heat, 汗水 is rarely used in clinical or purely physiological contexts. Instead, it carries a strong literary and metaphorical tone, often symbolizing hard work, perseverance, sacrifice, or sincere effort — as in the phrase '挥洒汗水' (to shed sweat) or '用汗水浇灌梦想' (to nurture dreams with sweat).

This word appears frequently in motivational speeches, inspirational writing, poetry, and media coverage of athletes, farmers, construction workers, or students striving toward goals. It evokes dignity in labor and emotional resonance, making it more elevated and expressive than the neutral term 汗. While both words refer to sweat, 汗水 emphasizes the human effort behind it — not just the biological process, but the value and meaning embedded in that effort.