◎ 约定俗成 yuēdìng-súchéng[established by usage;accepted through common practice;convention] 事物的名称或法则,经人相约遵用,久而久之,为社会所公认或实用 名无固宜,约之以命,约定俗成谓之宜,异于约则谓之不宜。——《荀子·正名》-----------------国语辞典:事物的名称或法则,经人倡导,而成为社会习用或公认者。《荀子.正名》:「名无固宜,约之以命,约定俗成谓之宜,异于约则谓之不宜。」
1.说话守信用。 -----------------国语辞典:说话诚实有信用。《论语.学而》:「与朋友交,言而有信。」明.崔时佩、李景云《南西厢记.第三五出》:「老夫人将小姐甘心许,言而有信,因此上不敢慢于人。」反出尔反尔,言而无信英语 to speak and keep one's promise (idiom); as good as one's word法语 (expr. idiom.) tenir sa promesse