Plural of hellery; mischievous, playful, or reckless behavior; tricks, pranks, or wild antics.
From hellery plus -ies (plural form). Hellery likely comes from Hell as slang for wild or uncontrolled behavior, with -ery creating a noun for such conduct.
Helleries is a wonderfully old-fashioned word—it captures the feeling of youthful mischief without being mean-spirited, like boys causing harmless chaos. You don't hear it much anymore, but it perfectly describes the kind of reckless fun that used to define childhood adventures.
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