信口雌黃
simp信口雌黄seon3 hau2 ci1 wong4xìn kǒu cí huáng
English
- to speak off the cuff
- to casually opine
- to make irresponsible remarks; wag one's tongue too freely;
粵語 — Cantonese
- 本指稱讚晉代王衍能夠隨口更正講錯嘅説話，後來比喻不顧事實真相，隨口批評。雌黃即雞冠石，過去寫字用黃紙，寫錯咗就用黃色嘅雌黃塗抹後重寫。
Sources: cc-cedict, rime-cantonese, words.hk