‘补丁’ (bǔ dīng) literally means ‘to mend’ (补) + ‘a small, square piece’ (丁), evoking the image of a small piece of material sewn onto torn fabric to repair it. In everyday usage, it refers to a physical patch used to fix holes or tears in clothing, furniture, or other materials — especially common in contexts of frugality or DIY repair.

In modern computing, ‘补丁’ has taken on a technical meaning: a software update designed to fix bugs, close security vulnerabilities, or add minor features without replacing the entire program. This metaphorical extension mirrors the physical idea of ‘mending’ a flawed system. The word is widely understood across both traditional and digital contexts, though the software sense dominates in tech-related conversations among younger speakers and professionals.