‘没关系’ (méi guān xì) is a common, polite interjection meaning ‘it doesn’t matter’, ‘no problem’, or ‘don’t worry about it’. Literally, 没 means ‘not have’, 关 means ‘to concern’ or ‘to involve’, and 系 means ‘connection’ or ‘relation’—so the phrase conveys ‘there is no connection/concern’ between the action and any negative consequence. It’s used to reassure someone after a minor mistake, inconvenience, or apology, softening social tension and expressing forgiveness or indifference.

This phrase functions as a complete utterance in conversation—it rarely appears mid-sentence and almost never takes grammatical modifiers. It’s neutral in register: appropriate with friends, colleagues, and elders alike, though slightly more formal than casual alternatives like ‘没事’ (méi shì). It reflects a core cultural value of maintaining harmony and avoiding blame, especially in situations involving small errors, delays, or unintended disruptions.