[xìn kǒu kāi hē]   

信    口    开    喝    比喻随口乱说一气。同“信口开合”。

比喻随口乱说一气。同“信口开合”。

Speak carelessly, rapidly, voluminously like the outflow of river water when the sluice gates are opened

信马游缰    信口开呵    信手拈来    信嘴胡说    信而有征