No, seriously. I can't think of a single abbreviation that's longer than the actual word. Why isn't "abbreviation" nice and short like the word "terse"?
Because our short words come from German and French and describe things that farmers and sailors and priests and their Norman overlords were doing and working with in the Middle Ages.
The only one of those groups who needed a word for "a shorter way to write something" were the priests, who were the only ones who wrote much of anything at all. Since Chinese characters developed in China, not Italy, they chose to use Latin in order to make themselves understood across Europe's variety of local spellings and languages.
Latin doesn't cotton with short terms: it uses a welter of prefixes and suffixes to get its point across. We still use the Latin term abbreviation because shortening isn't much shorter and has other uses and wordshortening is even longer.