约定俗成 Traditional 約定俗成 yuē dìng sú chéng 🔊 established by popular usage (idiom) HSK 7–9 + Keep this word Meanings yuē dìng sú chéng 約定俗成 established by popular usage (idiom); common usage agreementcustomary convention Its characters 约yuēto make an appointmentHSK 4定dìngto fix; to set; to make definiteHSK 4俗súcustomHSK 7–9成chéngto succeedHSK 6