都行 (dōu xíng) is an informal, versatile adverbial phrase meaning 'all fine', 'either is okay', or 'it doesn’t matter'. Literally, 都 (dōu) means 'all' or 'both', and 行 (xíng) means 'okay', 'acceptable', or 'works'. Together, they express indifference, flexibility, or willingness to accept any option — especially when responding to choices or suggestions. It’s commonly used in spoken Mandarin during casual conversations about plans, food, timing, or preferences.

The phrase functions as a complete response or sentence-final modifier, often replacing longer expressions like 'I don’t mind' or 'whatever you prefer'. It carries a relaxed, accommodating tone and is rarely used in formal writing. While grammatically it can follow subjects or verbs, in everyday speech it most frequently stands alone or appears at the end of a sentence after a list of options (e.g., '喝咖啡还是喝茶？——都行。'). Its simplicity and warmth make it a staple in friendly, cooperative exchanges.