English Reference

Word

decline

Phoneticsde·cline, stress on the second syllable

US/dɪˈkɫaɪn/

UK/dɪklˈaɪn/

Definitions

01to decrease

B2 · Upper Intermediate

v. to become smaller, fewer, or less in quality.

v. to gradually become less, smaller, or weaker. Intransitive in this sense.

“The number of people living in the village has declined over the last ten years.”

“The local manufacturing industry has declined significantly as global trade patterns shifted toward digital services.”

02to refuse

B2 · Upper Intermediate Formal

v. to politely say no to an invitation, offer, or request.

v. to refuse to accept or do something, typically in a formal or polite manner.

“I offered him a lift to the station, but he declined because he wanted to walk.”

“The minister declined to comment on the ongoing investigation, citing the need for confidentiality until the final report is published.”

Antonyms

03grammar

C2 · Proficiency Science Technical · Academic

v. to change the ending of a word to show its grammatical role in a sentence.

v. to inflect a noun, pronoun, or adjective for case, number, or gender.

“In Latin, you must decline nouns to show if they are the subject or the object.”

“The student struggled to correctly decline the third-declension nouns during the advanced grammar examination.”

Usage

The verb takes a noun phrase as its object, usually the word or category being inflected.

Teaching tip

This is a technical term used in linguistics; students of Latin, German, or Greek will be familiar with the concept.

Synonyms

inflect

04a reduction

B2 · Upper Intermediate Countable noun

n. a gradual decrease in the quality, amount, or importance of something.

n. a gradual and continuous loss of strength, numbers, quality, or value.

“There has been a sharp decline in the price of electric cars recently.”

“The sudden decline in biodiversity within the national park has prompted urgent calls for stricter environmental protections.”

Usage

Often used with the preposition 'in'.

05a slope

C1 · Advanced Countable noun Formal

n. a physical slope that goes downwards.

n. a downward slope or inclination, such as a hill or a road.

“The road has a steep decline, so drivers should use their brakes carefully.”

“The hikers found the long decline into the valley much harder on their knees than the initial climb had been.”

Synonyms

Antonyms

Collocations

Common phrases and expressions where native English speakers use the word “decline” in context.

Noun

01. decline in

“There has been a sharp decline in the number of people smoking over the last decade.”

noun + prep

02. general decline

“The report highlights a general decline in the quality of public services.”

adj + noun

03. gradual decline

“The patient showed a gradual decline in health over several months.”

adj + noun

04. population decline

“The government is concerned about the rapid population decline in rural areas.”

noun + noun

05. rapid decline

“The company faced a rapid decline in sales after the scandal was revealed.”

adj + noun

06. significant decline

“Economists noted a significant decline in consumer spending this quarter.”

adj + noun

Real-World Examples

“Much of that decline is likely caused by public health policies and public messaging about the harms of smoking.”
The Conversation 17 Aug 2026
“Other studies show that academic outcomes fall when funding declines .”
The Conversation 17 Aug 2026
“Women who used the therapy were also less likely to show memory problems or declines in their ability to carry out everyday functions.”
ScienceDaily 14 Aug 2026
“This is in contrast to the decline of support for Israel in many western countries, including the United States, since the war.”
The Guardian 11 Aug 2026

Etymology

From Middle English declinen, and ultimately Latin declīnō (“to bend, turn aside, deflect, inflect, decline”, from dē- (“down”) + clīnō (“to bend, to incline”)), from Proto-Indo-European *ḱley- (English lean). The senses arrived from two separate pathways in Middle English: * The grammatical sense came from Old English declīnian, which was borrowed directly from the Latin etymon. * All senses except the grammatical sense were derived from those of Old French decliner. Old French itself borrowed the verb from Latin.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Related words

Domain

Grammar

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Common
Level
B2 · Upper IntermediateOxford
Updated

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