污点 literally means 'dirty spot' — 污 (wū) means 'dirty' or 'soiled', and 点 (diǎn) means 'spot' or 'point'. Together, they form a noun that refers to a physical stain (e.g., on clothing or a surface) or, more commonly, a metaphorical blemish — especially in one’s reputation, character, or record. It carries a slightly formal or literary tone and is often used in contexts involving moral failure, scandal, or lasting damage to credibility.

The word frequently appears in discussions of personal integrity, political careers, historical legacy, or legal records. Unlike casual terms like 污渍 (wūzì, 'stain' — purely physical), 污点 implies lasting negative significance and is rarely used for trivial imperfections. It may also appear in fixed phrases like 人生污点 (rénshēng wūdiǎn, 'a blot on one’s life') or 历史污点 (lìshǐ wūdiǎn, 'a stain on history').