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deflate

/dɪˈfleɪt//dɪˈfleɪt/·verb
to collapse as air escapes, or to be let down; to reduce someone's confidence or an inflated level
Fig. 1 — The cap flicks off the valve and the air mattress starts telling the truth.
01Definition

To deflate is to go down as the air goes out — a tyre deflates, a balloon deflates, an air mattress deflates into a wrinkled sheet. From Latin flare, 'to blow', with a reversing de-, it is inflate run backwards, and every figurative use keeps the picture: a cutting remark deflates your confidence, a lost final leaves a team deflated, and a central bank can deflate an overheated economy. What deflates does not merely shrink; it slumps, because the shape was only ever the air inside it.

02In use
  • iThe rear tyre deflated slowly overnight, flat by morning.
  • iiOne withering review was enough to deflate his confidence.
  • iiiThe mattress deflates in minutes once the valve is opened.
03Collocations
  • deflate a tyre
  • the balloon deflated
  • feel deflated
  • deflate someone's ego
  • deflate expectations

Family deflation (noun) · deflated (adjective) · deflationary (adjective)

04Relations

=collapse, flatten, go down, shrink, puncture

≠inflate, expand, swell

05Compared
PairThe difference
deflate vs inflateair (or value) escapes and it slumps → deflate; air (or value) is forced in and it swells → inflate.
06TOEFL & IELTS

Three senses, three exam contexts. Literal: tyres, balloons, anything air-filled (process descriptions). Emotional: feel deflated — the standard collocation for sudden discouragement, useful in TOEFL integrated speaking about setbacks. Economic: deflation is the technical noun for falling prices — the opposite of inflation — and TOEFL/IELTS reading passages assume you will not confuse a deflating balloon with a deflating economy. The adjective deflated does double duty: a deflated ball, a deflated candidate.

07Asked
What is the difference between deflate and deflation in economics?
Deflate is the verb, deflation the technical noun — and in economics they mean falling prices, not escaping air. Deflation is a sustained drop in the general price level (the opposite of inflation), usually a symptom of weak demand; economists fear it because buyers postpone purchases and debts grow heavier. 'The tyre deflated' and 'Japan fought deflation for a decade' share only the Latin root: blowing out.
What does 'feeling deflated' mean?
Suddenly drained of enthusiasm or confidence — the emotional version of the mattress in the scene above: full one moment, slumped the next. It is the standard word for the specific letdown after built-up hope: a rejected application, a cancelled trip, a flat response to news you were excited to share. The deflating force is usually named with 'by': deflated by the criticism.
What does it mean to deflate someone's ego?
To puncture their inflated self-importance — bring them down to actual size, usually with one well-placed remark or defeat. The idiom depends on the ego being oversized to begin with: you deflate what was puffed up. Unlike humiliate, it can carry approval; a deflating comment from a mentor may be exactly what an overconfident student needs.
Is it deflate or inflate for letting air out?
Deflate — inflate pumps air in and the thing swells; deflate lets it out, the de- prefix acting as the reversal switch on the same Latin verb flare, 'to blow'. The full side-by-side, with both animated scenes, is on the deflate vs inflate page linked in the 'Compared' list above.
What things can deflate, literally?
Anything that holds its shape with air or gas: tyres, balloons, air mattresses, footballs, bouncy castles, life rafts, even lungs in medical prose (a collapsed lung is a deflated one). The verb runs both directions grammatically — the tyre deflated overnight (by itself), or we deflated the dinghy to pack it (someone did it). If the thing is solid all the way through, it cannot deflate — a rock only erodes or shrinks.
Does deflate always mean something bad?
No — it depends on what was inflated. A deflated tyre is a problem; deflated expectations, an ego taken down a size, or a housing bubble gently deflated are corrections. Central bankers, in fact, dream of deflating bubbles without bursting them. The emotional sense is the reliably negative one: 'I felt deflated' never reports good news.