pressurise (Verb) — Increase the pressure on a gas or liquid.
pressurise (Verb) — Maintain a certain pressure. ex. "the aeroplane cabin is pressurised" ex. "pressurise a space suit"
pressurise (Verb) — Increase the pressure in or of. ex. "The captain will pressurise the cabin for the passengers' comfort"
pressurise (Verb) — Put pressure on someone (to do something).