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To talk absolute nonsense or rubbish
Negative
None
瞎说八道 (xiā shuō bā dào)
None
《五灯会元》(Wǔ Dēng Huì Yuán), a Sòng Dynasty (宋, 960-1279) collection of scrolls on Zen Buddhism in China by 释普济 (Shì Pǔ Jǐ)
This chengyu is from a line in the work listed in the "Origin" section above