Frightening apparitions, ghosts, or bogey creatures in folklore; things that scare or frighten people.
From Scottish 'bogle' meaning phantom or goblin, possibly from Gaelic 'bogaidh' meaning bogey. Often used in Celtic folklore to describe mischievous or frightening spirits.
Bogles are the original source of the boogeyman—they're specifically Scottish and Irish folklore creatures that parents used to keep children from wandering into actual bogs and getting lost.
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