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English definition of “turn on sb”

turn on sb

phrasal verb with turn     /tɜːn/ US  /tɝːn/ verb
to attack or criticize someone suddenly and unexpectedly: Suddenly she just turned on me and accused me of undermining her.Disapproving and criticizingDamaging reputation
(Definition of turn on sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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