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Definition of psycho noun from the Oxford Advanced Learner's Dictionary

psycho

noun

/ˈsaɪkəʊ/

/ˈsaɪkəʊ/

(plural psychos)

(informal, offensive)

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an offensive word for a person who you think is crazy, strange or violent
Word Origin1930s: abbreviation.

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See psycho in the Oxford Advanced American Dictionary

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B2

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