‘Gǎi cuò’ literally means ‘to change (gǎi) a mistake (cuò)’, and functions as a verb meaning ‘to correct a mistake’ or ‘to fix an error’. The character 改 conveys the idea of altering, modifying, or rectifying something already existing, while 错 refers specifically to an error, fault, or inaccuracy — whether in writing, speech, calculation, or behavior. Together, they form a common, action-oriented compound used especially in educational, professional, and everyday contexts where accuracy matters.

This verb is frequently used in classroom settings (e.g., teachers asking students to gǎi cuò after a test), language learning (correcting grammar or spelling errors), and office work (revising documents or data). It implies an intentional, often step-by-step process of identifying and then fixing the error — not merely deleting it, but replacing it with the right version. While it can be used transitively (e.g., gǎi cuò wénzhāng — ‘correct the article’), it’s also commonly used without an explicit object when the context makes the error clear.