Home / Words / deflateNo. 0064

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

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 — the pair are exact opposites: inflate pumps air in and the thing swells; deflate lets air out and it collapses. The de- prefix is the reversal switch on the same Latin verb flare, 'to blow'. Note that deflating needs no puncture: tyres deflate slowly through the rubber itself, losing a little pressure every month, which is why pressure checks exist at all.
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.