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English definition of “read (sb) the riot act”

read (sb) the riot act

to speak angrily to someone about something they have done and warn them that they will be punished if they do it again: He'd put up with a lot of bad behaviour from his son and thought it was time to read him the riot act.Chastising and rebuking
(Definition of read (sb) the riot act from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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