run off at the mouth

US /rʌn ɔf æt ðə maʊθ/
UK /rʌn ɔf æt ðə maʊθ/
"run off at the mouth" picture
1.

hablar por los codos, irse de la lengua, soltar la lengua

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.
Tiende a hablar por los codos cuando ha bebido un poco.
Don't tell him your secrets; he'll just run off at the mouth to everyone.
No le cuentes tus secretos; simplemente se irá de la lengua con todo el mundo.