pressurize

An air pressure increase is what pressurize means - when you add more air to something and make it higher than usual.

When we talk about pressurizing, we usually mean making an environment or system have a certain level of air pressure. For example, airplanes need to be pressurized so that passengers can breathe easily at high altitudes. It's also common in scuba diving - divers must pressurize their equipment before they go underwater to prevent it from expanding and causing problems. Sometimes we talk about pressurizing liquids or gases for storage, like filling a tank with compressed air. Pressurization is used in many other areas too, such as medical devices and even some kinds of sports equipment.