This page is about the phrasal verb muck upINFORMAL
If you muck something up, you do it badly and fail to achieve your goal.
mess up, screw up (informal)
- muck up sth I went to a new barber today and he mucked up my hair style. It looks terrible.
- muck sth up Sally went to a job interview today, and she thinks she mucked it up. She said she was really nervous and she couldn't think clearly.
Contributor: Matt Errey