Мы в Telegram на канале Учим Английский
shoot off one's mouth
Высказывать мнение, не зная всех фактов; говорить так, как будто все знаешь.
Tom has never been to Florida, but he's always shooting his mouth off about how superior Florida is to California.
I want to study the problem before I shoot off my face.
The editor of the newspaper is always shooting his mouth off about the trouble in Africa.