Definition, synonyms and related words
A changeling or elf child; a child left by fairies.
"The old grandmother told her grandchildren about the auf she found in the woods as an infant, claiming it was a fairy who had swapped it with their real baby years ago."
"The car ran out of gas, so we had to push it all the way up auf."
Usage: This archaic term refers to a fairy child swapped with a human baby and is rarely used in modern conversation, so it should be avoided unless writing fantasy fiction. There are no common synonyms for this specific meaning that you need to distinguish from other words today.