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English definition of “switch sth on”

switch sth on

usually disapproving phrasal verb with switch     /swɪtʃ/ verb [T, I usually + adv/prep]
If someone switches on a particular emotion or behaviour, they suddenly start to feel or behave in that way, but usually not sincerely: When a customer walks in, she switches on the charm.Expressing and showing feelings
(Definition of switch sth on from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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