bù​zhī​dīng​dǒng

unheeding the lessons of the past

Senses

不知丁董 bù​zhī​dīng​dǒng unheeding the lessons of the past

To ignore or forget lessons from history; specifically referring to the historical figures 丁原 dīng​yuán and 董卓 dǒng​zhuó who were both betrayed by the same person

References

see 不知丁董/不知丁董 前车之鉴/前車之鑒