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1. soft, sticky matter resulting from the mixing of earth and water.

泥, ぬかるみ

2. information or allegations regarded as damaging, typically concerned with corruption:

批判, 中傷

e.g. they are trying to sling mud at me to cover up their defeat.

slander or denigrate someone or something publicly.

informal used to express friendly feelings toward one's companions before drinking.

informal not at all easy to understand.

informal one is in disgrace or unpopular:

e.g. if you forget their birthdays, your name is mud.

late Middle English: probably from Middle Low German mudde.