汗

Primary sense is perspiration or sweat. In medical contexts (e.g., //Neijing//), it refers to both the substance and the physiological process of sweating, often as a therapeutic action used to expel pathogens.

Primarily functions as a noun, commonly appearing as the object of verbs of motion or emergence (e.g., 流 “to flow,” 出 “to emerge”). In specialized medical shorthand or technical prose, it may function as a verb meaning “to sweat” or “to induce sweating.”

Note the phonetic similarity to 寒 (//hán//, cold). While semantically opposite, be alert for potential phonetic loans or scribal slips if "sweat" is contextually incongruous and "cold" provides a coherent reading.

When appearing in clusters with 血 (blood) or 淚 (tears), the glyph typically functions as part of a triad signifying extreme suffering or total physical collapse.