一言九鼎 yīyánjiǔdǐng weighty words Origin Definitions Defs Strokes Stroke Words Sentences Sents 一言 yīyán noun one word a single word, a brief remark, or one sentence九鼎 jiǔdǐng immense weight (literary) Used to describe something of immense weight or significance, often used in the idiom 一言九鼎 yīyánjiǔdǐng