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Phrase(s): muddy something up
Lit. 1. to make water muddy; to stir up the mud in water, as at the bottom of a pond or river. • Don’t muddy the water up. It will clog our filters. • Don’t muddy up the water. 2. Fig. to make something unclear. • You have really muddied this issue up. I thought I understood it. • You sure muddied up this issue.
McGrawhill's American Idioms And Phrasal Verbs