transitive verb. To maintain normal air pressure in (an enclosure, as an aircraft or submarine).

transitive verb. To cause to have or function at greater than normal air or gas pressure.

transitive verb. To put (gas or liquid) under a greater than normal pressure.

transitive verb. To subject to psychological, political, or other nonphysical pressure.

verb. To put pressure on; to put under pressure.

verb. increase the pressure in or of

verb. maintain a certain pressure

verb. increase the pressure on a gas or liquid