noun
a person, typically young, who rejects established social norms, especially of dress and behavior, and advocates a broad spectrum of beliefs and practices that are alternatives to or at odds with the status quo
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The hippie movement of the 1960s was characterized by a rejection of mainstream society and a focus on peace and love.
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My aunt used to be a hippie back in the day, she still loves tie-dye shirts and peace signs.
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That guy over there with the long hair and tie-dye shirt is a total hippie.
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Her free-spirited nature and love for nature make her a modern-day hippie.