¦ noun
1. dirt or mud.
informal something unpleasant or worthless.
2. manure.
¦ verb
1. (muck something up) informal spoil something.
(muck about/around with something) spoil something by interfering with it.
2. (muck something out) chiefly Brit. remove manure and other dirt from a stable etc.
3. (muck about/around) Brit. informal behave in a silly or aimless way.
4. (muck someone about/around) Brit. informal treat someone inconsiderately, typically by disrupting their plans.
5. (muck in) Brit. informal share tasks or accommodation.
Phrases
Lord (or Lady) Muck Brit. informal a socially pretentious man (or woman).
Origin
ME
muk, prob. of Scand. origin: cf. ON
myki 'dung', from a Gmc base meaning 'soft', shared by
meek.