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to break down

to break down

36 3.7
To make something separate into smaller parts by a chemical process
  • phrasal verb
  • /breɪk daʊn/
  • Specialized
translation icon : descomponer
  • The material is said to break down completely under composting conditions.
  • break down organic matter
  • enzymes break down
  • break down polymers

This is not broken down as much because it's really dry.

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Examples

  • The bacteria in compost help to break down organic waste into nutrient-rich soil.

  • In the human digestive system, enzymes break down food into simpler molecules.

  • The body eventually begins to break down its own tissue.

  • "The middle layer of dry material helps the pile break down," he says.

    Academic text (1995)
  • There's a problem because the paper breaks down into an acid which makes them rot even faster.

  • Over time, exposure to other liquids can slowly break down the waterproof seals inside your phone.

  • So lactase is the enzyme which breaks down lactose.

  • Soil microorganisms break down the organic contaminants, and the treated water percolates to recharge the underlying groundwater.

    Academic text (2002)
  • For example, in a eutrophic lake sediment, microbes may break down phytoplankton and macrophytes, releasing phosphorus.

    Academic text (2000)
  • When exposed to sunlight, plastics can break down into smaller fragments over time.

Synonyms

to split
vsto break down
513 1.3

To break something into two or more parts

is about chemical separation into elements rather than physical dividing
to separate
vsto break down
297 1.9

To break into parts or pieces

is specifically about chemical breakdown into basic elements, not general division
to break up
vsto break down
66 2.7

Separate something into smaller pieces

is used for chemical decomposition into components rather than ending or dividing groups
to split up
vsto break down
47 2.6

To divide something into smaller parts

is about chemical change into elements rather than dividing for sharing
to come apart
vsto break down
44 3.1

To break into pieces or fall into separate parts

is about chemical change into basic elements rather than passive physical fragmentation
to disintegrate
vsto break down
  • Specialized
29 6.0

Break into smaller parts by losing energy in a physical process, for example in an atom

is about chemical change into basic elements rather than physical fragmentation
to break apart
vsto break down
26 3.0

To separate into pieces, for example a machine or a group

is focused on chemical separation into elements rather than literal physical collapse
to decompose
vsto break down
  • Specialized
9 5.5

To break a substance into smaller chemical parts using heat or chemicals

is the same meaning but uses a different phrasing
to dissociate
vsto break down
  • Specialized
1 7.4

To split a molecule into atoms or ions

is the same chemical splitting but usually permanent rather than reversible

Antonyms

179 4.1

To join things or ideas so they form one whole

55 6.4

To combine ideas or materials to make something new

How Decomposed

to decay
37 4.4
to decompose
  • Specialized
9 5.5
to break down
  • Specialized
36 3.7
to separate
297 1.9

Surface Forms

break down infinitive
breaking down present participle
breaks down third person singular
broke down past
broken down past participle

Morphology

break + down

There is a clear connection between 'break' (to stop or interrupt) and 'down' (suggesting reduction or completion), so a learner might partially infer a sense of something being made ineffective or collapsing. However, the specific sense 'to fail' (as in negotiations breaking down) is a phrasal-verb meaning that is not fully predictable from the constituents and therefore only partially transparent to a B1 learner.

Etymology

Break down comes from the image of a substance that breaks and falls down into smaller pieces, like food in digestion. So it means 'to separate into simpler elements'.