muck up

1. (informal, intransitive, transitive)To ruin unintentionally.

   The terrorists have really mucked up our holiday plans.

   make a mess of, destroy or ruin

2. (Australia, informal, intransitive)To clown around; to have fun, often at the expense of others.

   It's the last day of school and everyone is mucking up.

1. He realised now that he had mucked everything up.

   deEr war sich nun im Klaren, dass er alles verpfuscht hatte.

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irregular

• muck upTo ruin unintentionally.
• muck outTo clean the excrement and other rubbish from the area where an animal is kept, such as a horse stable or a dog kennel.
• muck inTo join in with work.
• muck aroundTo muck about.
• muck aboutTo do random unplanned work or spend time idly