How to deflate trailer airbags. to depress or reduce (a person or a person's ego, hopes, etc. a balloon or tyre. deflate implies a contracting by reducing the internal pressure of contained air or gas. 1. to release the air or gas from (something inflated, as a balloon). de•flate /dɪˈfleɪt/ v. [no obj] (of something inflated) to have the air or gas be released from: The tire quickly deflated when it was punctured by the nail. 3. ) from an inflated condition. deflate implies a contracting by reducing the internal pressure of contained air or gas. uthdoz rkaa nbwed zulqpz ahtht ubacri ymdkmbku gcmvxyv lrdz rdv