deflate

IPA/dɪˈfleɪt/
KK[dɪflˈet]IPA/dɪˈfleɪt/

deflate — verb

  • deflatepresent simple I / you / we / they
  • deflateshe / she / it
  • deflatedpast simple
  • deflating-ing form

1. When a tyre, balloon, or other container loses the air or gas inside it, becomin

1.verbtransitive / intransitiveB1
Definition

When a tyre, balloon, or other container loses the air or gas inside it, becoming smaller or flattening — either naturally because the air escapes, or because somebody lets the air out on purpose.

Example

The children watched the red balloon slowly deflate and fall to the ground.

intransitive: [object] deflates naturally

Wei used a small pump to deflate the mattress before storing it in the cupboard.

transitive: deflate [object]

Common collocations
  • tyre deflates
  • balloon deflates
  • deflate a mattress
  • slowly deflate
  • completely deflated
Synonyms
  • collapse

    focuses on the structure falling inward; a building collapses, but a balloon is not usually said to collapse

  • flatten

    emphasises the resulting flat shape rather than the mechanism of air loss

  • empty

    broader — you can empty a balloon of water, but empty alone does not specify air or gas release

Antonyms
  • inflate

    the direct opposite: to fill with air or gas

Grammar Patterns

[object] deflates

deflate [object]

Usage Note

Frequently used both transitively (deflate a balloon) and intransitively (the balloon deflated). The transitive form usually describes a deliberate action; the intransitive may describe a natural or accidental loss of air.

Common Mistakes

I deflated the balloon by throwing it out the window.
I deflated the balloon by letting the air out.
'deflate' specifically means releasing the contained air or gas; it does not mean damaging or destroying the object.

2. To reduce the strength, power, or effectiveness of an abstract thing such as an

2.verbtransitiveB2
Definition

To reduce the strength, power, or effectiveness of an abstract thing such as an argument, a plan, a system, or someone's hopes.

Example

The new evidence deflated the main argument of the prosecution's case.

deflate + abstract object (argument)

Criticism from several experts deflated the company's ambitious expansion plans.

Common collocations
  • deflate an argument
  • deflate hopes
  • deflate confidence
  • deflate enthusiasm
Synonyms
  • undermine

    suggests gradual, hidden damage; closer to 'weaken from below'

  • weaken

    more general; any loss of strength, not specific to air or pressure imagery

  • reduce

    broader and less vivid; simply means to make smaller or less

Antonyms
  • strengthen

    the opposite of weaken or reduce effectiveness

Grammar Patterns

[factor] deflates [abstract noun]

Usage Note

The object is typically an abstract concept (argument, hopes, confidence, enthusiasm, plan). The subject is often an event, new information, or an external factor rather than a person acting deliberately.

Common Mistakes

The manager deflated the meeting with a joke.
The price cut deflated the company's profits.
With this sense, the subject is usually a thing (fact, event, factor) rather than a person's deliberate action.

3. To make someone feel less confident, proud, or important, especially by unexpect

3.verbtransitiveB2
Definition

To make someone feel less confident, proud, or important, especially by unexpectedly pointing out a failure or by saying something critical.

Example

The teacher's sharp remark during class deflated the student's arrogant attitude.

deflate + possessive + attitude/ego

Kwame felt completely deflated when his proposal was rejected without any explanation.

passive: feel deflated

Common collocations
  • deflate someone's ego
  • deflate someone's pride
  • deflate someone's confidence
  • feel deflated
Synonyms
  • humiliate

    stronger — implies public shame and loss of dignity

  • embarrass

    focuses on awkwardness rather than loss of confidence or importance

  • deflate (sense 2)

    overlaps in reducing something, but sense 2 targets plans and ideas while sense 3 targets a person's feelings

Antonyms
  • encourage

    to give someone confidence or hope

  • boost

    to increase confidence or morale

Grammar Patterns

[event/person] deflates [person]

Usage Note

Often appears in the passive (be/get deflated) to describe a resulting emotional state. Distinguish from sense 2: sense 2 weakens a plan or argument (abstract object), while this sense deflates a person's confidence or pride (personal/emotional effect).

Common Mistakes

The bad news deflated the stock price.
The bad news deflated investors' confidence.
Use this sense for people's feelings and emotions, not for prices or markets (use 'fall' or 'drop' instead).

4. To reduce the total amount of money in a country's economic system, usually as a

4.verbtransitiveC1
Definition

To reduce the total amount of money in a country's economic system, usually as a deliberate government action intended to lower or control prices.

Example

The central bank decided to deflate the economy by raising interest rates sharply.

deflate + economy

Government measures to deflate the currency caused export prices to become more competitive.

deflate + currency

Common collocations
  • deflate the economy
  • deflate the currency
  • deflate prices
Synonyms
  • contract

    more general; can describe any economic shrinkage, not just deliberate policy

  • tighten

    commonly used with 'monetary policy' rather than directly with 'the economy'

Antonyms
  • inflate

    in economic usage, to increase the money supply or cause prices to rise

Grammar Patterns

[government/bank] deflates [economy/currency]

Usage Note

Domain-specific to economics and government policy. The subject is typically a central bank, finance ministry, or government. This sense is the opposite of 'inflate' in economic contexts.

Word family

Synonym discussion

Sense: verb/1

Deflate, collapse, flatten, and empty all describe a loss of shape or contents, but they differ in cause and typical use. Deflate is specific to containers of air or gas: a balloon deflates, a tyre deflates, an airbed deflates. Collapse suggests a sudden falling inward under pressure, which may or may not involve air — a chair collapses, a roof collapses. Flatten means to become flat, usually by pressing or removing internal contents; a cardboard box is flattened for recycling, not deflated. Empty is the broadest: you can empty a balloon of air, but you can also empty a bucket of water, whereas deflate only works for containers of compressed gas. Choose deflate when the key idea is air or gas escaping from a sealed container; use collapse when the focus is structural failure; use flatten for any result that is flat regardless of mechanism; and use empty when the container's contents are removed by any method.

deflate ↗collapse ↗flatten ↗empty ↗

Common collocations

Adverbs

Prepositions

Etymology

LatinEnglish

Deflate was formed in English in the late 1800s from the Latin prefix de- (meaning 'down' or 'away') and flare (meaning 'to blow'). The original physical sense described letting air out of a tyre or balloon. Figurative uses — weakening an argument or humbling a person — appeared in the early 1900s, and the economic sense of reducing the money supply followed in the 1920s.