breathe a word
US /briːð ə wɜːrd/
UK /briːð ə wɜːrd/

1.
souffler mot, dire un mot
to tell a secret or something confidential to someone
:
•
Don't breathe a word of this to anyone.
Ne souffle mot de cela à personne.
•
She promised not to breathe a word about our plans.
Elle a promis de ne pas souffler mot de nos projets.