To deflate is to let the air out of something. If you deflate the tires on your brother's bike, he won't be able to ride it until he gets them pumped up again.

You can deflate anything that's full of air or another gas: an air mattress, an inflatable sled, a helium balloon, or the tires on your car. When something, like a hot air balloon, empties of air, you can also say it deflates. Figuratively, a person can also deflate when they are suddenly drained of self-assurance or cheer: "Hearing him criticize me in front of the class made me deflate."

Definitions of deflate
  1. verb
    release contained air or gas from
    deflate the air mattress”
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    type of:
    release, turn
    let (something) fall or spill from a container
  2. verb
    collapse by releasing contained air or gas
    deflate a balloon”
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    type of:
    fold or close up
  3. verb
    become deflated or flaccid, as by losing air
    “The balloons deflated
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    blow up, inflate
    fill with gas or air
    type of:
    decrease, diminish, fall, lessen
    decrease in size, extent, or range
  4. verb
    reduce or lessen the size or importance of
    “The bad review of his work deflated his self-confidence”
    synonyms: puncture
  5. verb
    produce deflation in
    “The new measures deflated the economy”
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    cause prices to rise by increasing the available currency or credit
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  6. verb
    reduce or cut back the amount or availability of, creating a decline in value or prices
    deflate the currency”
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    increase the amount or availability of, creating a rise in value
    type of:
    bring down, cut, cut back, cut down, reduce, trim, trim back, trim down
    cut down on; make a reduction in
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