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

1.
告诉, 透露
to tell a secret or something confidential to someone
:
•
Don't breathe a word of this to anyone.
不要把这件事告诉任何人。
•
She promised not to breathe a word about our plans.
她答应不会把我们的计划告诉任何人。