mud-slinging

• n. 诽谤；指对反对者的侮辱性的；不公正的；诽谤的评论

例句

用作名词 (n.)

1. She often threw mud at her colleagues.
   她经常诽谤她的同事。
2. They were using not criticism but mud.
   他们不是在批评而是在诽谤。