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to filter out

to filter out

20 3.8
To remove unwanted things from water, air, or lists by letting the rest pass
  • phrasal verb
  • /ˈfɪltər aʊt/
translation icon : filtrar
  • The water purification system can filter out harmful contaminants to provide clean drinking water.
  • filter out noise
  • filter out particles
  • filter out information

The gumtragusanth gets filtered out, leaving just the fluid.

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Examples

  • All nonessential compounds have been filtered out.

  • If it detects any insulin in my bloodstream without that marker, it filters it out.

    Fiction book (1999)
  • Why would Google Earth filter out good data?

  • And this part of our brain, its job is to help us see what we're focused on and to filter out the rest.

  • Let's filter out all the noise we picked up along the way.

  • I will have to filter out all other energy emissions.

  • In our everyday lives, our minds filter out most of the information our senses give us.

  • Over time, I had learned to filter out his actual voice and hear only the kiosk's translation.

    Fiction book (1997)
  • The atmosphere eventually filters out many secondary cosmic rays before they reach Earth's surface.

    Academic text (2004)
  • Layers of sand and granular activated carbon then filter out any remaining particles.

    Academic text (2003)

Synonyms

to filter
vsto filter out
138 3.0

To pass something through a device that removes unwanted parts

is the same meaning but used as a verb plus particle form
to flush out
vsto filter out
51 4.5

Force unwanted people or things out of a place, often using water

is the gentler process of passing material through a porous medium rather than forceful expulsion
to purge
vsto filter out
49 6.3

To remove unwanted substances, things, or people by cleaning

is a specific mechanical removal via a porous medium, rather than broad forcible cleansing
to refine
vsto filter out
  • Specialized
41 3.9

Remove unwanted parts from a material to make it pure

emphasizes removal by passing through a porous medium rather than broader improvement
to weed out
vsto filter out
37 3.8

To remove unwanted people or things from a group

is mainly about removing physical unwanted substances by passing through a porous medium
to purify
vsto filter out
30 4.6

To remove dirt and bad chemicals from water or air to make them clean

is narrower, describing removal by a porous medium rather than general cleansing
to strain
vsto filter out
26 3.7

To remove solid bits from a liquid using a filter or sieve

is used to remove any unwanted substances or elements, not only solids
to strip
vsto filter out
  • Specialized
15 6.3

Remove a substance or part from material like soil

is about removal by passing through a porous medium rather than chemical action
to wash out
vsto filter out
9 2.0

Clean something using water to remove dirt or stains

is a more targeted action using a porous medium rather than broad liquid cleaning
to screen out
vsto filter out
9 4.3

To check and remove people or things that are not wanted

is focused on removing material by passing it through a porous medium, not inspection
to decontaminate
vsto filter out
  • Specialized
9 7.0

To remove harmful substances from a place or thing to make it safe

is not limited to dangerous pollutants, focusing on removal by a porous medium
to separate out
vsto filter out
  • Specialized
7 3.7

Remove one part from a mixture using a filter or another method

is specific to removal by passing material through a porous medium rather than any method
to draw
vsto filter out
7 8.2

Pass a liquid through a sieve to remove solids

is the broader act of removing unwanted elements rather than just extracting by straining
to clarify
vsto filter out
  • Specialized
5 4.2

To remove solid bits so a liquid becomes clear

focuses on removal by a porous medium rather than mainly using heat
to detoxify
vsto filter out
2 5.4

To remove harmful substances from something to make it safe

is general removal by a porous medium rather than specifically targeting toxins
to deionize
vsto filter out
  • Specialized
1 8.6

To remove ions from water to make it purer

is broader, applying to many unwanted materials, not only charged particles
to sieve out
vsto filter out
1 5.3

Remove unwanted bits from food or material by passing them through a screen

focuses on removal by passing material through a porous medium rather than by selection
to filtrate
vsto filter out
  • Specialized
7.3

To remove solid parts from a liquid or gas using a filter

is the same action but expressed with the phrasal verb form
purifying
vsto filter out
  • Specialized
4.2

Removes harmful or unwanted substances to make something clean

focuses on the process of passing material through a porous medium, not the final cleanliness
to detoxicate
vsto filter out
7.5

Take harmful substances out of something to make it safe

is neutral to toxicity, focusing on removing any unwanted elements by a porous medium
to filter out the dross
vsto filter out
  • Informal
7.2

To remove unwanted things so only useful ones remain

is a literal process of passing material through a porous medium, not metaphorical selection

Antonyms

1.0

Include something extra to make something larger or better

15 3.1

To put or add something into another thing

How Thorough

to eradicate
85 6.6
to eliminate
  • NSFW
502 3.4
to filter out
20 3.8

Surface Forms

filter out infinitive
filtered out past participle
filtering out present participle
filters out third person singular

Morphology

filter + out

The meaning 'to remove unwanted substances or elements' is directly derivable from combining 'filter' (to separate or remove unwanted parts) with the particle 'out' which signals removal or exclusion. This verb+particle composition follows a common, predictable pattern in English (and similar constructions exist in other languages), so a B1 learner who knows both constituents should be able to infer the MWE meaning.

Etymology

Filter out comes from the everyday picture of pouring a mixture through a filter, which catches the unwanted bits while the clean part goes out. So, it means 'to remove unwanted things'.