muck
Pronunciation: /mʌk/
noun
verb

Phrases
Phrasal Verbs
-
muck about/around
- British informal behave in a silly or aimless way: we just muck around in training and have a laugh
-
muck about/around with
- tinker with (something), typically so as to damage or spoil it: have you been mucking about with the aerial?
-
muck someone about/around
- treat someone inconsiderately, typically by disrupting their plans: what the management has to learn is that we can’t be mucked about
-
muck in
- British informal share tasks or accommodation without expecting a privileged position: she really enjoys mucking in with the lads
-
muck something up
- informal do something badly or ineptly; mishandle something: she had mucked up her first few weeks at college

Origin:
Middle English muk, probably of Scandinavian origin: compare with Old Norse myki 'dung', from a Germanic base meaning 'soft', shared by meek