English Reference
verb · noun

decline

v. · n.
US /dɪˈkɫaɪn/ UK /dɪklˈaɪn/ de·cline UK spelling declines

  1. 01 B2 Upper Intermediate

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

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

    Simple

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

    In context

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

  2. 02 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.

    Simple

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

    In context

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

  3. 03 C2 Proficiency TechnicalAcademic Science

    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.

    Simple

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

    In context

    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.

    Teacher's tip

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

    inflect
  4. 04 B2 Upper Intermediate

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

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

    Simple

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

    In context

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

    Usage

    Often used with the preposition 'in'.

  5. 05 C1 Advanced Formal

    n.a physical slope that goes downwards.

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

    Simple

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

    In context

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

Usage decline in · general decline · gradual decline

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

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.

This entry
Origin Old French decliner
Level B2 · Upper Intermediate
Frequency Common
Updated