What does "sludge" mean?
Solids separated from suspension in a liquid.
Sludge
/slʌd͡ʒ/ noun, verb, slang
noun, verb, slang ·Common ·High school level
Meaning at a glance
- Primary sense: Solids separated from suspension in a liquid.
- Grammar: sludge is listed as noun, verb, slang.
- Nearest alternatives: muck, slime, berg, calf.
- Useful contrasts: clean surface, clean water, clear liquid.
- Usage evidence: I can't imagine anything would grow in that toxic sludge.
How to use "sludge"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "sludge" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "sludge" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "sludge" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "sludge" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "sludge" is acting as noun, verb, slang in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "muck" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "sludge", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
Definitions
Noun
- 1 Solids separated from suspension in a liquid. countable, uncountable
"Floods in northern India, mostly in the small state of Uttarakhand, have wrought disaster on an enormous scale.[…]Rock-filled torrents smashed vehicles and homes, burying victims under rubble and sludge."
- 2 An acronym used to help remember the common symptoms of certain affections of a cholinergic toxidrome: salivation, lacrimation, urination, defecation, gastrointestinal upset, emesis. mnemonic
- 3 the precipitate produced by sewage treatment wordnet
- 4 A residual semi-solid material left from industrial, water treatment, or wastewater treatment processes. countable, uncountable
- 5 any thick, viscous matter wordnet
Show 4 more definitions
- 6 A sediment of accumulated minerals in a steam boiler. countable, uncountable
- 7 A mass of small pieces of ice on the surface of a water body. countable, uncountable
- 8 Ellipsis of sludge metal. abbreviation, alt-of, ellipsis, uncountable
- 9 Institutional policies that introduce tedium and inefficiency in processes. countable, uncountable
"In the 2008 best seller Nudge, the legal scholar Cass R. Sunstein and the economist Richard H. Thaler marshaled behavioral-science research to show how small tweaks could help us make better choices. An updated version of the book includes a section on what they called “sludge”—tortuous administrative demands, endless wait times, and excessive procedural fuss that impede us in our lives."
Verb
- 1 To slump or slouch. informal, intransitive
- 2 To slop or drip slowly. intransitive
Antonyms
clean surfaceclean waterclear liquiddry land
Example
"I can't imagine anything would grow in that toxic sludge."
Common questions
What is a synonym for "sludge"?
Common synonyms include: muck, slime, berg, calf, clay, cryosphere.
How do you use "sludge" in a sentence?
I can't imagine anything would grow in that toxic sludge.
How do you pronounce "sludge"?
Pronounced /slʌd͡ʒ/.
Etymology
From Middle English slugge, sluche (“mud, mire”), probably an alteration of Middle English sliche, slicche ("mud, slush, tar"; whence Modern English slitch), from Old English *sliċ, from Proto-West Germanic *sliki, *slīk, from Proto-Germanic *slikiz, *slīką (“mud, slush”). Cognate with Dutch slijk, German Schlick. Compare also slush.