Don't shoot off your mouth if you don't know the facts.

不了解情况不要乱放炮。

《新英汉大辞典》

Don't shoot off your mouth, you might regret it later.

不要乱说话，你以后可能会后悔的。

youdao

Don't shoot off your mouth, you might regret it later.

不要乱说话，你以后可能会后悔的。

youdao