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.

to depress or reduce (a person or a person's ego, hopes, spirits, etc.); puncture; dash

Her rebuff thoroughly deflated me.

to reduce (currency, prices, etc.) from an inflated condition; to affect with deflation.

to become deflated.

verb

blow up , expand , inflate , boost , build up

verb

collapse , decrease , depreciate , depress , devalue , diminish , empty , exhaust , flatten , puncture , shrink , squash , void , chasten , cut down to size , dash , debunk , disconcert , dispirit , humble , kick in the teeth , knock down * , let down easy , let wind out of sails , mortify , puncture balloon , put down * , shoot down * , take down * , explode , devaluate , humiliate , lessen , reduce