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English definition of “tell on sb”

tell on sb

verb uk phrasal verb with tell   /tel/ (told, told) us  

(INFORM)

informal to give information about someone, usually something bad that they have said or done, especially to a person in authority

(AFFECT BADLY)

to have a bad effect on someone's health or behaviour: A succession of late nights had begun to tell on him and his work was suffering.
(Definition of tell on sb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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