What does "backfill" mean?
The material that has been used to refill an excavation.
Backfill
/ˈbækfɪl/ noun, verb
noun, verb ·Rare ·Advanced level
Meaning at a glance
- Primary sense: The material that has been used to refill an excavation.
- Grammar: backfill is listed as noun, verb.
- Nearest alternatives: post filled, scab.
- Useful contrasts: backhoes, ditches, spades.
- Usage evidence: "There are long established plans by which the police will... obviously keep the public safe, but they will prioritize those things that they have to do. And the army is, of course, always ready to backfill as and when. But that is under the reasonable worst-case scenario,” Johnson said this week.
How to use "backfill"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "backfill" 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 "backfill" 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 "backfill" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "backfill" 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 "backfill" is acting as noun, verb 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 "post filled" 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 "backfill", 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 The material that has been used to refill an excavation. countable, uncountable
- 2 Reserve support personnel. US, countable, uncountable
- 3 That which backfills; a replacement. US, countable, uncountable
- 4 Material in a story set earlier in the past, providing history or context for the current action. countable, uncountable
Verb
- 1 To refill a hole with the material dug out of it.
"Clay excavated for the new river channel has been used to backfill the old watercourse, while embankment vegetation was also moved from the old channel to the new in order to preserve a habitat for the rare Four Spotted Moths that live there."
- 2 To refill an excavation unit to restore the former ground surface and/or to preserve the unit and make it recognizable as having been excavated.
"We backfilled the cistern with pea gravel to discourage its use as a refuse container."
- 3 To provide reserve support. US
- 4 To replenish or restock due to attrition or loss. US
"The company backfilled Joe's position after he was terminated."
- 5 To enter an online game that's already in progress, replacing a player who left early.
Synonyms
All synonyms post filledscab
Example
""There are long established plans by which the police will... obviously keep the public safe, but they will prioritize those things that they have to do. And the army is, of course, always ready to backfill as and when. But that is under the reasonable worst-case scenario,” Johnson said this week."
Common questions
What is a synonym for "backfill"?
Common synonyms include: post filled, scab.
How do you use "backfill" in a sentence?
"There are long established plans by which the police will... obviously keep the public safe, but they will prioritize those things that they have to do. And the army is, of course, always ready to backfill as and when. But that is under the reasonable worst-case scenario,” Johnson said this week.
How do you pronounce "backfill"?
Pronounced /ˈbækfɪl/.
Etymology
From back + fill.