[xìn kǒu kāi hē]   

信    口    开    呵    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

信口雌黄    信以为真    信步而行    信口开河    信马由缰