mud slinging
sling/throw mud at (someone) if someone slings mud at another person, they try to make other people have a low opinion of them by saying unpleasant things about them

[TahlilGaran] Dictionary of Contemporary English ▲

mud-slinging
sling/throw mud at (someone) - if someone slings mud at another person, they try to make other people have a low opinion of them by saying unpleasant things about them.
I left Hollywood because I was fed up with all the mud-slinging that goes on there.

[TahlilGaran] English Idioms Dictionary ▲