信口雌黄信口雌黃

xìn kǒu cí huáng

Meaning

to speak off the cuff; to casually opine

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Characters

信xìnto trust, to believe; letter, sign亻言口kǒumouth; entrance, gate, opening冂一雌cífemale; feminine; gentle, soft此隹黄huángyellow; surname由八