Daily Chinese Idiom Guessing Game
A lesson learned from past mistakes; a warning from previous failures.
鉴镜子，为教训。前面车子翻倒的教训。比喻先前的失败，可以做为以后的教训。
《荀子·成相》前车已覆，后未知更何觉时！”汉·刘向《说苑·善说》前车覆，后车戒。”
The company's bankruptcy was a 前车之鉴 for others in the industry.