A boggart is a type of bogie from Celtic mythology. Specificaly, a boggart is a Brownie that has been mistreated, and therefore likely to play tricks on humans.
Sometimes defined as a Brownie that has turned evil, but that is an exaggeration.
In Harry Potter and the Prisoner of Azkaban, a boggart is described by Hermione Granger as a shape-shifter that will take the shape of whatever it thinks you fear the most.
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