Etymology
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slop (n.)

c. 1400, "mudhole," probably from Old English -sloppe "dung" (in plant name cusloppe, literally "cow dung"), related to slyppe "slime" (from PIE root *sleubh- "to slide, slip"). Meaning "semi-liquid food" first recorded 1650s; that of "refuse liquid of any kind, household liquid waste" (usually slops) is from 1815. Meaning "affected or sentimental material" is from 1866.

slop (v.)

"to spill carelessly" (transitive), 1550s, from slop (n.1). Intransitive sense from 1746. Related: Slopped; slopping.

slop (n.2)

late 14c., "loose outer garment," perhaps from Old English oferslop "surplice," which seems to be related to Middle Dutch slop, Old Norse sloppr (either of which also might be the source of the Middle English word), perhaps all from Proto-Germanic *slup-, from PIE root *sleubh- "to slide, slip" on the notion of a garment one "slips" on or into (compare sleeve). Sense extended generally to "clothing, ready-made clothing" (1660s), usually in plural slops. Hence, also, slop-shop "shop where ready-made clothes are sold" (1723).

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Definitions of slop
1
slop (n.)
wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk;
Synonyms: slops / swill / pigswill / pigwash
slop (n.)
deep soft mud in water or slush;
they waded through the slop
Synonyms: mire
slop (n.)
(usually plural) waste water from a kitchen or bathroom or chamber pot that has to be emptied by hand;
she carried out the sink slops
slop (n.)
(usually plural) weak or watery unappetizing food or drink;
he lived on the thin slops that food kitchens provided
slop (n.)
writing or music that is excessively sweet and sentimental;
Synonyms: treacle / mush / glop
2
slop (v.)
cause or allow (a liquid substance) to run or flow from a container;
Synonyms: spill / splatter
slop (v.)
walk through mud or mire;
Synonyms: squelch / squish / splash / splosh / slosh
slop (v.)
ladle clumsily;
slop the food onto the plate
slop (v.)
feed pigs;
Synonyms: swill
From wordnet.princeton.edu