Moderate as in foul up To spoil or ruin something, often by making a mess or causing disorder; to defile or mess up. Clear All
2 Example Sentences Showcasing the Meaning of 'Muck-up'
An unexpected power outage had the potential to muck-up the progress of the important research experiment.
The comedian's attempt to improvise a joke on stage ended up in a muck-up, leaving the audience awkwardly silent.
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