IPA: /ˈmʌdˌslɪŋər/
KK: /ˈmʌdˌslɪŋɚ/
A person who makes false or unfair accusations against someone, especially in politics, to damage their reputation.
During the election, the candidate accused his opponent of being a mudslinger for spreading lies about him.
Mudslinger → The word is formed from "mud" (from Old English *mudd*, meaning wet earth or soft soil) and "slinger" (from the verb "sling", meaning to throw). A mudslinger is someone who throws mud, metaphorically speaking, to damage someone's reputation, often through slander or insults.
Think of someone throwing 'mud' to 'damage' someone's reputation — that's why a mudslinger is someone who tries to tarnish others.