run off at the mouth
US /rʌn ɔf æt ðə maʊθ/
UK /rʌn ɔf æt ðə maʊθ/

1.
bercakap banyak, membocorkan rahsia, berceloteh
to talk too much, especially in a boastful or indiscreet way
:
•
He tends to run off at the mouth when he's had a few drinks.
Dia cenderung bercakap banyak apabila dia minum beberapa gelas.
•
Don't tell him your secrets; he'll just run off at the mouth to everyone.
Jangan beritahu dia rahsia awak; dia hanya akan bercakap banyak kepada semua orang.