Definition & Meaning of "muck up"

to muck up

[phrase form: muck]

to mess up and not succeed because of a mistake that completely ruins something

Dialect

British

Example

The chef was disappointed when he realized he had mucked up the recipe, resulting in a disastrous dish.

Please do n't muck the report up with formatting errors; it needs to be polished and professional.

to cause something to become dirty or messy

Dialect

British

Example

It 's easy to muck up your shoes if you walk through muddy areas during the rainy season.

Please do n't muck the kitchen up with spills and stains; clean up as you go.

to hinder the success of a plan or arrangement through careless or disruptive behavior

Dialect

British

Example

The team's lack of coordination threatened to muck about the carefully laid-out project schedule.

Despite careful planning, unexpected issues mucked it up, causing delays in the project timeline.

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