没错 (méi cuò) literally means 'not wrong' — combining 没 (méi, 'not') and 错 (cuò, 'mistake' or 'error'). It functions primarily as an interjection or adverb meaning 'correct', 'right', 'exactly', or 'that’s right', used to confirm, agree with, or affirm a statement. It often appears in spoken Chinese during conversations to signal strong agreement or validation, similar to saying 'You’re absolutely right!' or 'That’s spot on!' in English.

The phrase is informal and conversational, rarely used in formal writing. While it looks like a noun phrase, it does not function as a subject or object — you wouldn’t say 'I want 没错' or 'This is 没错'. Instead, it stands alone or follows a clause to endorse its truth. It can also appear mid-sentence for emphasis, especially after a pause or repetition, reinforcing confidence in what was just said.