Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

muck up

verb

Definition of muck up 

transitive verb

: to make a mess of : bungle, spoil

Synonyms Example Sentences Learn More about muck up

Keep scrolling for more

Examples of muck up in a Sentence

I swear, she mucks up everything she tries.

First Known Use of muck up

1896, in the meaning defined above

Keep scrolling for more

Learn More about muck up

Dictionary Entries near muck up

muck soil

muckstick

mucksy

muck up

muckworm

mucky

mucocutaneous

Statistics for muck up

Look-up Popularity

Time Traveler for muck up

The first known use of muck up was in 1896

See more words from the same year

More from Merriam-Webster on muck up

Rhyming Dictionary: Words that rhyme with muck up

Thesaurus: All synonyms and antonyms for muck up

Comments on muck up

What made you want to look up muck up? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

zibeline

a soft lustrous wool fabric with mohair

Get Word of the Day daily email!

Test Your Vocabulary

Late Autumn 2018 Words of the Day Quiz

  • frosted-autumn-leaves
  • Which is a synonym of yahoo?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play

Ask the Editors

Word Games