shoot your mouth off

US /ʃuːt jʊər maʊθ ɔːf/
UK /ʃuːt jʊər maʊθ ɔːf/
"shoot your mouth off" picture
1.

nói huyên thuyên, nói bô bô

to talk too much, especially in a boastful or indiscreet way

:
He tends to shoot his mouth off after a few drinks.
Anh ấy có xu hướng nói huyên thuyên sau vài ly.
Don't shoot your mouth off about the surprise party.
Đừng nói huyên thuyên về bữa tiệc bất ngờ.