The original naming of inflation meant inflating the money supply, but of course this is something.the central banks don't want people to talk about (and central banks arw tightly controlling what's taught in macroeconomy).

From Wikipedia: Historically, rapid increases in the quantity of money or in the overall money supply have occurred in many different societies throughout history, changing with different forms of money used. For instance, when gold was used as currency, the government could collect gold coins, melt them down, mix them with other metals such as silver, copper, or lead, and reissue them at the same nominal value. By diluting the gold with other metals, the government could issue more coins without increasing the amount of gold used to make them.