Definitions from Wiktionary ( )

▸ noun:  (European folklore, also figurative) In pre-modern European folklore: an infant of a magical creature that was secretly exchanged for a human infant. In British, Irish and Scandinavian mythology the exchanged infants were thought to be those of fairies, sprites or trolls; in other places, they were ascribed to demons, devils, or witches.
▸ noun:  (by extension) A person or object (especially when regarded as inferior) secretly exchanged for something else.
▸ noun:  (by extension, informal, rare) An infant secretly exchanged with another infant deliberately or by mistake; a swapling.
▸ noun:  (fantasy, science fiction) An organism which can change shape to mimic others; a shape-shifter.
▸ noun:  (archaic, also figurative) A person apt to change their loyalty or thinking; a waverer.
▸ noun:  (obsolete) An idiot, a simpleton.
▸ adjective:  (archaic, rare) Changeable, fickle, inconstant, wavering.

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