muddle up

Related to muddle up: muddle through

muddle up

1. To render something awkward, confusing, and disorderly; to obscure or obfuscate something. A noun or pronoun can be used between "muddle" and "up." Often used in passive constructions. The introduction of new tariffs is likely to further muddle up the already complicated relationship between the two countries. They muddled the contract up with all sorts of misleading, cryptic language. Our roles within the team have become so muddled up that we've largely given up the idea of job titles.
2. To mix something up (with something else). A noun or pronoun can be used between "muddle" and "up"; often used in passive constructions. They look so alike that I always muddle up their names when I see them. I must have muddled the data points up when I was entering them into the system.
See also: muddle, up
Farlex Dictionary of Idioms.

muddle something up

to mix something up; to make something confusing. You really muddled the language of this contract up. Who muddled up the wording?
See also: muddle, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

muddled (up)

mod. alcohol intoxicated. I’ve had a little too much muddler, I think. Anyway, I’m muddled.
See also: muddle, up
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • add in
  • all right
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you
  • (you've) got to get up pretty early in the morning to (do something)
  • a straw will show which way the wind blows
  • a crack at (someone or something)
  • (you) wanna make something of it?
  • all for the best
  • a thing of the past