shoot your mouth off

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

bercakap besar, bercakap sembarangan

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

:
He tends to shoot his mouth off after a few drinks.
Dia cenderung bercakap besar selepas beberapa minuman.
Don't shoot your mouth off about the surprise party.
Jangan bercakap besar tentang parti kejutan itu.