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📕 rednote ID(小红书号)：3881567312

Filter: Definition, Usage & Examples Explained (3 meaning)

Meaning 1：strain (filter)

filter 🔊

/ˈfɪltə/

n./v.

To remove unwanted parts from something by passing it through a device or a process.

strain 🔊

➕

/streɪn/

n./v.

The action of removing unwanted elements from a substance by passing it through a porous material or a specific process.

📁 Category：Technological Inventions 🔖 Level：Intermediate

📘 Details & Usage

📖 Root Explanation

From Old English 'filtrian', meaning to purify, likely from Medieval Latin 'filtrum' meaning 'felt' used to strain liquids.

💡 Mnemonic

Think of a COFFEE FILTER – it lets the good stuff (liquid) through while keeping the bad stuff (grounds) out.

📖 Example

Before pouring the freshly squeezed juice into the glass, she filtered it to remove all the tiny seeds and pulp. 🔊 Before pouring the freshly squeezed juice into the glass, she strained it to remove all the tiny seeds and pulp.

🔗 Collocations

filter out – to remove something unwanted from a substance or group

filter through – to pass or move slowly through something that acts as a barrier

water filter – a device that removes impurities from water

🔄 Synonyms

strain (v.) – to separate solids from liquids by passing through a sieve

sift (v.) – to put a fine, loose substance through a sieve to remove lumps or large particles

purify (v.) – to remove contaminants from something

🚫 Antonyms

contaminate (v.) – to make something impure by exposure to or addition of a poisonous or polluting substance

pollute (v.) – to make air, water, or land dirty and dangerous

🌱 Derivatives

filterable (adj.) – capable of being filtered

filtration (n.) – the process of filtering

📖 Cultural Story

The term originates from the concept of using porous materials like felt (Latin 'filtrum') to strain liquids. This physical process evolved metaphorically in the 20th century to describe sifting information, light, or data, reflecting our need to manage complexity in technology and media.

Meaning 2：a strainer device (filter)

filter 🔊

/ˈfɪltə/

n./v.

A device or piece of equipment that removes unwanted substances from a liquid, gas, light, or information.

Visual comparison of a paper coffee filter and a water filter cartridge.

a strainer device 🔊

➕

/ə ˈstreɪnər dɪˈvaɪs/

n./v.

A physical object designed to trap and remove unwanted particles from a fluid, gas, light, or data stream.

📁 Category：Objects & Materials 🔖 Level：Elementary

📘 Details & Usage

📖 Example

The air purifier has a HEPA filter that captures 99% of the dust and pollen in the room. 🔊 The air purifier has a HEPA strainer device that captures 99% of the dust and pollen in the room.

🔗 Collocations

air filter – a device that removes dust and contaminants from air

replace the filter – to put a new, clean filter in place of an old one

filter paper – porous paper used in laboratories for filtration

🔄 Synonyms

strainer (n.) – a device with a mesh for separating solids from liquids

sieve (n.) – a tool with a meshed or perforated bottom used for separating coarse from fine parts

purifier (n.) – a device that removes impurities from something, especially air or water

🚫 Antonyms

contaminant (n.) – a polluting or poisonous substance that makes something impure

pollutant (n.) – a substance that pollutes air, water, or land

🌱 Derivatives

filterless (adj.) – operating without a filter

Meaning 3：trickle out (filter)

filter 🔊

/ˈfɪltə/

n./v.

(Of information or news) to gradually become known to the public, often from secret or unofficial sources.

Metaphor for information filtering, showing a journalist receiving a tip.

trickle out 🔊

➕

/ˈtrɪkəl aʊt/

n./v.

The metaphorical process by which information or news slowly becomes public knowledge, often from unofficial or secret sources.

📁 Category：Language Evolution 🔖 Level：Advanced

📘 Details & Usage

📖 Example

Details about the company's new product design began to filter out to the media months before the official launch. 🔊 Details about the company's new product design began to trickle out to the media months before the official launch.

🔗 Collocations

filter out – to gradually become known (used for information, news, rumors)

filter through – to become gradually known by people

news filters – news slowly spreads or becomes known

🔄 Synonyms

trickle (v.) – to come or go slowly or gradually in small numbers or amounts

seep (v.) – to flow or pass slowly through small openings or pores; to spread gradually

leak (v.) – to intentionally or accidentally give secret information to the public

🚫 Antonyms

gush (v.) – to flow or send out quickly in large amounts; to speak with excessive enthusiasm

flood (v.) – to arrive or be released in overwhelmingly large quantities