make a muck of
make a muck of (something)
To ruin, bungle, or spoil something. Primarily heard in UK. I really made a muck of that project at work—I'm going to get fired for sure! I'm afraid the accounting department made a complete muck of these numbers. We'll need to tally the entire ledger again.
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make a muck ofhandle incompetently; bungle. British informal
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