mud-slinging
noun
• the use of insults and accusations, especially unjust ones, with the aim of damaging the reputation of an opponent.
• "politicians seem to rely on mud-slinging instead of argument"
mud-sling
verb
• make malicious or scandalous allegations about an opponent with the aim of damaging their reputation.
• "it's difficult to see how any parliamentary opposition would voluntarily give up the opportunity to smear and mud-sling"
