Muck is a goopy, muddy substance, like the muck at the bottom of a pond or the muck you clean out of the gutters on your house once a year.

You can also use muck to mean animal manure, its original, 13th-century meaning — specifically, "cow dung and vegetable matter used as manure." The definition has expanded since then to include any number of dirty, slimy substances, from the mud on the bottom of a lake to the sludge in a flooded basement. As a verb, to muck is either to remove animal waste or to spread manure on a field.

Definitions of muck

n any thick, viscous matter

goo, gook, goop, guck, gunk, ooze, slime, sludge
sludge (rich in organic matter) that accumulates at the bottom of lakes or oceans
Type of:
that which has mass and occupies space

n fecal matter of animals

droppings, dung
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buffalo chip, chip, cow chip, cow dung
a piece of dried bovine dung
fossil excrement; petrified dung
pigeon droppings
droppings of pigeons
cow pie, cowpie
fecal matter of a cow
Type of:
BM, dejection, faecal matter, faeces, fecal matter, feces, ordure, stool
solid excretory product evacuated from the bowels

v remove muck, clear away muck, as in a mine

Type of:
remove, take, take away, withdraw
remove something concrete, as by lifting, pushing, or taking off, or remove something abstract

v spread manure, as for fertilization

Type of:
scatter, spread, spread out
strew or distribute over an area

v soil with mud, muck, or mire

“The child mucked up his shirt while playing ball in the garden”
mire, muck up, mud
Type of:
begrime, bemire, colly, dirty, grime, soil
make soiled, filthy, or dirty

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