Treasure belonging to fairies and often supposed to be inexhaustible, or to disappear or to change into something worthless when revealed to others or used by humans.
Origin
Early 17th century; earliest use found in William Barksted (fl. 1607–1630), actor and poet.
Definition of fairy treasure in US English:
fairy treasure
(also fairies' treasure, fairy's treasure)
noun
Treasure belonging to fairies and often supposed to be inexhaustible, or to disappear or to change into something worthless when revealed to others or used by humans.
Origin
Early 17th century; earliest use found in William Barksted (fl. 1607–1630), actor and poet.