Meaning of “turn on sb” in the English Dictionary

british dictionary

"turn on sb" in British English

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turn on sb

phrasal verb with turn uk /tɜːn/ us /tɝːn/ verb

to attack or criticize someone suddenly and unexpectedly:

Suddenly she just turned on me and accused me of undermining her.

(Definition of “turn on sb” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)