Word: 约定俗成 (yuēdìngsúchéng) Traditional: 約定俗成 约定俗成 dictionary entry yuēdìngsúchéng established by popular usage (idiom); customary convention Full dictionary entry for 约定俗成 Example sentences using 约定俗成 2 sentences, showing page 1 of 1. 排队是大家约定俗成的规矩。 Páiduì shì dàjiā yuēdìngsúchéng de guīju. Queuing is a customary rule everyone follows. 这种叫法早已约定俗成。 Zhèzhǒng jiàofǎ zǎoyǐ yuēdìngsúchéng. This way of naming it became established by common usage long ago.