shoot one's mouth off
成語所屬單字mouth
shoot one's mouth off — 慣用語
1. to speak loudly, recklessly, or boastfully, especially about things one does not
1.慣用語
釋義
胡亂吹噓
to speak loudly, recklessly, or boastfully, especially about things one does not know much about or should keep secret
例句
The rookie player shot his mouth off about winning the match, then lost badly.
I wish Jabari would stop shooting his mouth off about our plans before they are confirmed.