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

1.
告訴, 透露
to tell a secret or something confidential to someone
:
•
Don't breathe a word of this to anyone.
不要把這件事告訴任何人。
•
She promised not to breathe a word about our plans.
她答應不會把我們的計畫告訴任何人。