'Dǔ lòu' literally combines 堵 (dǔ), meaning 'to block' or 'to plug', and 漏 (lòu), meaning 'leak' or 'seepage'. Together, it means 'to plug a leak' — a verb describing the action of stopping unintended flow, whether of liquid, gas, or even abstract things like information. It's commonly used in contexts involving physical infrastructure (e.g., pipes, roofs, containers) and medical settings (e.g., sealing a wound or vascular leak).

The term carries a practical, problem-solving connotation and often appears in technical, maintenance, or emergency response language. While it can be used metaphorically (e.g., 'plugging an information leak'), its most frequent usage is concrete and functional. It’s typically followed by an object (e.g., 堵漏工作, 堵漏材料) or used as part of a compound verb phrase (e.g., 进行堵漏, 完成堵漏). The word implies urgency and effectiveness — the goal is to restore integrity and prevent further loss or damage.