Wiktionary
whisper campaign
alt. (context idiomatic English) A method of persuasion in which damaging rumors or innuendo are deliberately spread concerning a person or other target, while the source of the rumors tries to avoid detection. n. (context idiomatic English) A method of persuasion in which damaging rumors or innuendo are deliberately spread concerning a person or other target, while the source of the rumors tries to avoid detection.
Usage examples of "whisper campaign".
A whisper campaign among The Believers tagged McCain, a red-white-and-blue war veteran, as Satan’.
Using sources inside my church, they began a whisper campaign meant to rip us apart.
In the end, they settled for a whisper campaign, a simple variation on the unkind children?