shoot your mouth off
US /ʃuːt jʊər maʊθ ɔːf/
UK /ʃuːt jʊər maʊθ ɔːf/

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.