信口开河

[成语]
xìn kǒu kāi hé

[含义]
比喻随口乱说一气。

[来源]
元·王实甫《西厢记》第二本第三折：“你那里休聒，不当一个信口开合知。”

[例句]
村老老是～，情哥哥偏寻根究底。 清·曹雪芹《红楼梦》第三十九回


[英文]
speak carelessly , rapidly , voluminously like the outflow of river water when the sluice gates are opened