Fixed

How did the phrase "I got my pet fixed" come about when referring to getting an animal neutered when in fact the part being "fixed" is actually "broke" now?

The dictionary lists about 15 meanings for "fix," only one of which is "repair."

I wasn't there when people started using "fix" that way, but I suppose it began as a euphemism. In generations past, people avoided revealing any facts about sex when children were present. Depending on local culture and so forth, "children" could include anyone under age 21 who wasn't married.