1
general::
muck sb/sth about/around
mainly UK informal
to behave in a silly way, or to treat someone or something in a careless way
• Stop mucking about with those ornaments, you'll break something!
• I'm fed up with them mucking me about and cancelling our arrangements., muck sth up
[ M ] informal
to spoil something completely, or do something very badly
• I really prepared for the interview because I didn't want to muck it up.
• I mucked up the whole exam!, muck (sth) out
[ M ]
to clean a place where a large animal lives, especially a stable , by removing the waste products and old straw
• She'd spent all morning mucking out the horses.
Cambridge-Phrasal Verbs