verb (used with object), de·flat·ed, de·flat·ing.

  1. to release the air or gas from (something inflated, as a balloon): They deflated the tires slightly to allow the truck to drive under the overpass.
  2. to depress or reduce (a person or a person’s ego, hopes, spirits, etc.); puncture; dash: Her rebuff thoroughly deflated me.
  3. to reduce (currency, prices, etc.) from an inflated condition; to affect with deflation.

verb (used without object), de·flat·ed, de·flat·ing.

  1. to become deflated.


  1. to collapse or cause to collapse through the release of gas
  2. (tr) to take away the self-esteem or conceit from
  3. economics to cause deflation of (an economy, the money supply, etc)

1891, in reference to balloons, coinage based on inflate. Latin deflare meant “to blow away,” but in the modern word the prefix is taken in the sense of “down.” Related: Deflated; deflating.

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