Meanings
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1
noun
dirt, mud, manure, or other wet and unpleasant matter
The boots were coated in muck after the walk across the flooded field.
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2
noun
something morally corrupt, worthless, or distasteful
The editor refused to publish gossip that she considered pure muck.
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3
verb
to remove dirt or manure, or to make something dirty
They mucked out the stable before bringing in fresh straw.
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Etymology
From Middle English mok or muk, probably from Old Norse myki, 'dung,' and ultimately related to a Germanic root for slippery or wet matter. The concrete senses of dung and mud later broadened figuratively to worthless, corrupt, or dirty material.