shoot your mouth off

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

ouvrir sa bouche, parler trop

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

:
He tends to shoot his mouth off after a few drinks.
Il a tendance à ouvrir sa bouche après quelques verres.
Don't shoot your mouth off about the surprise party.
Ne parle pas trop de la fête surprise.